Address book

diff --git a/lib/l10n/app_en.arb b/lib/l10n/app_en.arb
index e9da14e..282d9bf 100644
--- a/lib/l10n/app_en.arb
+++ b/lib/l10n/app_en.arb
@@ -114,5 +114,32 @@
   "secretKeysPublicViewKey": "Public View Key",
   "scanQrTitle": "Scan QR Code",
   "confirmSendTitle": "Confirm Send",
-  "confirmSendDescription": "Transactions are irreversible, so make sure that these details match exactly."
+  "confirmSendDescription": "Transactions are irreversible, so make sure that these details match exactly.",
+  "addressBookTitle": "Address Book",
+  "addressBookAddContact": "Add Contact",
+  "addressBookEditContact": "Edit Contact",
+  "addressBookDeleteContact": "Delete Contact",
+  "addressBookDeleteContactConfirmation": "Are you sure you want to delete \"{contactName}\"?",
+  "@addressBookDeleteContactConfirmation": {
+    "placeholders": {
+      "contactName": {
+        "type": "String"
+      }
+    }
+  },
+  "addressBookDelete": "Delete",
+  "addressBookSearchHint": "Search contacts...",
+  "addressBookNoContacts": "No contacts yet",
+  "addressBookNoContactsDescription": "Add your first contact by tapping the + button",
+  "addressBookNoSearchResults": "No contacts found",
+  "addressBookCopyAddress": "Copy Address",
+  "addressBookEdit": "Edit",
+  "addressBookContactName": "Contact Name",
+  "addressBookUpdate": "Update",
+  "addressBookSave": "Save",
+  "addressBookAddressCopied": "Address copied to clipboard",
+  "sendSelectFromAddressBook": "Select from Address Book",
+  "sendSelectedContact": "Selected contact",
+  "sendClearSelectedContact": "Clear selected contact",
+  "sendEditAddress": "Edit Address"
 }
diff --git a/lib/l10n/app_localizations.dart b/lib/l10n/app_localizations.dart
index 5d7635d..77512d3 100644
--- a/lib/l10n/app_localizations.dart
+++ b/lib/l10n/app_localizations.dart
@@ -787,6 +787,126 @@ abstract class AppLocalizations {
   /// In en, this message translates to:
   /// **'Transactions are irreversible, so make sure that these details match exactly.'**
   String get confirmSendDescription;
+
+  /// No description provided for @addressBookTitle.
+  ///
+  /// In en, this message translates to:
+  /// **'Address Book'**
+  String get addressBookTitle;
+
+  /// No description provided for @addressBookAddContact.
+  ///
+  /// In en, this message translates to:
+  /// **'Add Contact'**
+  String get addressBookAddContact;
+
+  /// No description provided for @addressBookEditContact.
+  ///
+  /// In en, this message translates to:
+  /// **'Edit Contact'**
+  String get addressBookEditContact;
+
+  /// No description provided for @addressBookDeleteContact.
+  ///
+  /// In en, this message translates to:
+  /// **'Delete Contact'**
+  String get addressBookDeleteContact;
+
+  /// No description provided for @addressBookDeleteContactConfirmation.
+  ///
+  /// In en, this message translates to:
+  /// **'Are you sure you want to delete \"{contactName}\"?'**
+  String addressBookDeleteContactConfirmation(String contactName);
+
+  /// No description provided for @addressBookDelete.
+  ///
+  /// In en, this message translates to:
+  /// **'Delete'**
+  String get addressBookDelete;
+
+  /// No description provided for @addressBookSearchHint.
+  ///
+  /// In en, this message translates to:
+  /// **'Search contacts...'**
+  String get addressBookSearchHint;
+
+  /// No description provided for @addressBookNoContacts.
+  ///
+  /// In en, this message translates to:
+  /// **'No contacts yet'**
+  String get addressBookNoContacts;
+
+  /// No description provided for @addressBookNoContactsDescription.
+  ///
+  /// In en, this message translates to:
+  /// **'Add your first contact by tapping the + button'**
+  String get addressBookNoContactsDescription;
+
+  /// No description provided for @addressBookNoSearchResults.
+  ///
+  /// In en, this message translates to:
+  /// **'No contacts found'**
+  String get addressBookNoSearchResults;
+
+  /// No description provided for @addressBookCopyAddress.
+  ///
+  /// In en, this message translates to:
+  /// **'Copy Address'**
+  String get addressBookCopyAddress;
+
+  /// No description provided for @addressBookEdit.
+  ///
+  /// In en, this message translates to:
+  /// **'Edit'**
+  String get addressBookEdit;
+
+  /// No description provided for @addressBookContactName.
+  ///
+  /// In en, this message translates to:
+  /// **'Contact Name'**
+  String get addressBookContactName;
+
+  /// No description provided for @addressBookUpdate.
+  ///
+  /// In en, this message translates to:
+  /// **'Update'**
+  String get addressBookUpdate;
+
+  /// No description provided for @addressBookSave.
+  ///
+  /// In en, this message translates to:
+  /// **'Save'**
+  String get addressBookSave;
+
+  /// No description provided for @addressBookAddressCopied.
+  ///
+  /// In en, this message translates to:
+  /// **'Address copied to clipboard'**
+  String get addressBookAddressCopied;
+
+  /// No description provided for @sendSelectFromAddressBook.
+  ///
+  /// In en, this message translates to:
+  /// **'Select from Address Book'**
+  String get sendSelectFromAddressBook;
+
+  /// No description provided for @sendSelectedContact.
+  ///
+  /// In en, this message translates to:
+  /// **'Selected contact'**
+  String get sendSelectedContact;
+
+  /// No description provided for @sendClearSelectedContact.
+  ///
+  /// In en, this message translates to:
+  /// **'Clear selected contact'**
+  String get sendClearSelectedContact;
+
+  /// No description provided for @sendEditAddress.
+  ///
+  /// In en, this message translates to:
+  /// **'Edit Address'**
+  String get sendEditAddress;
 }
 
 class _AppLocalizationsDelegate
diff --git a/lib/l10n/app_localizations_en.dart b/lib/l10n/app_localizations_en.dart
index 9410a36..84a4801 100644
--- a/lib/l10n/app_localizations_en.dart
+++ b/lib/l10n/app_localizations_en.dart
@@ -369,4 +369,67 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get confirmSendDescription =>
       'Transactions are irreversible, so make sure that these details match exactly.';
+
+  @override
+  String get addressBookTitle => 'Address Book';
+
+  @override
+  String get addressBookAddContact => 'Add Contact';
+
+  @override
+  String get addressBookEditContact => 'Edit Contact';
+
+  @override
+  String get addressBookDeleteContact => 'Delete Contact';
+
+  @override
+  String addressBookDeleteContactConfirmation(String contactName) {
+    return 'Are you sure you want to delete \"$contactName\"?';
+  }
+
+  @override
+  String get addressBookDelete => 'Delete';
+
+  @override
+  String get addressBookSearchHint => 'Search contacts...';
+
+  @override
+  String get addressBookNoContacts => 'No contacts yet';
+
+  @override
+  String get addressBookNoContactsDescription =>
+      'Add your first contact by tapping the + button';
+
+  @override
+  String get addressBookNoSearchResults => 'No contacts found';
+
+  @override
+  String get addressBookCopyAddress => 'Copy Address';
+
+  @override
+  String get addressBookEdit => 'Edit';
+
+  @override
+  String get addressBookContactName => 'Contact Name';
+
+  @override
+  String get addressBookUpdate => 'Update';
+
+  @override
+  String get addressBookSave => 'Save';
+
+  @override
+  String get addressBookAddressCopied => 'Address copied to clipboard';
+
+  @override
+  String get sendSelectFromAddressBook => 'Select from Address Book';
+
+  @override
+  String get sendSelectedContact => 'Selected contact';
+
+  @override
+  String get sendClearSelectedContact => 'Clear selected contact';
+
+  @override
+  String get sendEditAddress => 'Edit Address';
 }
diff --git a/lib/l10n/app_localizations_pt.dart b/lib/l10n/app_localizations_pt.dart
index 96d34c2..2e12556 100644
--- a/lib/l10n/app_localizations_pt.dart
+++ b/lib/l10n/app_localizations_pt.dart
@@ -364,9 +364,73 @@ class AppLocalizationsPt extends AppLocalizations {
   String get scanQrTitle => 'Escanear QR Code';
 
   @override
-  String get confirmSendTitle => 'Confirm Send';
+  String get confirmSendTitle => 'Confirmar Envio';
 
   @override
   String get confirmSendDescription =>
-      'Transactions are irreversible, so make sure that these details match exactly.';
+      'As transações são irreversíveis, então certifique-se de que estes detalhes correspondem exatamente.';
+
+  @override
+  String get addressBookTitle => 'Lista de Contatos';
+
+  @override
+  String get addressBookAddContact => 'Adicionar Contato';
+
+  @override
+  String get addressBookEditContact => 'Editar Contato';
+
+  @override
+  String get addressBookDeleteContact => 'Excluir Contato';
+
+  @override
+  String addressBookDeleteContactConfirmation(String contactName) {
+    return 'Tem certeza que deseja excluir \"$contactName\"?';
+  }
+
+  @override
+  String get addressBookDelete => 'Excluir';
+
+  @override
+  String get addressBookSearchHint => 'Pesquisar contatos...';
+
+  @override
+  String get addressBookNoContacts => 'Nenhum contato ainda';
+
+  @override
+  String get addressBookNoContactsDescription =>
+      'Adicione seu primeiro contato tocando no botão +';
+
+  @override
+  String get addressBookNoSearchResults => 'Nenhum contato encontrado';
+
+  @override
+  String get addressBookCopyAddress => 'Copiar Endereço';
+
+  @override
+  String get addressBookEdit => 'Editar';
+
+  @override
+  String get addressBookContactName => 'Nome do Contato';
+
+  @override
+  String get addressBookUpdate => 'Atualizar';
+
+  @override
+  String get addressBookSave => 'Salvar';
+
+  @override
+  String get addressBookAddressCopied =>
+      'Endereço copiado para a área de transferência';
+
+  @override
+  String get sendSelectFromAddressBook => 'Selecionar da Lista de Contatos';
+
+  @override
+  String get sendSelectedContact => 'Contato selecionado';
+
+  @override
+  String get sendClearSelectedContact => 'Limpar contato selecionado';
+
+  @override
+  String get sendEditAddress => 'Editar Endereço';
 }
diff --git a/lib/l10n/app_pt.arb b/lib/l10n/app_pt.arb
index 3b35b00..027049b 100644
--- a/lib/l10n/app_pt.arb
+++ b/lib/l10n/app_pt.arb
@@ -113,6 +113,33 @@
   "secretKeysSecretSpendKey": "Chave Privada de Gasto",
   "secretKeysPublicViewKey": "Chave Pública de Visualização",
   "scanQrTitle": "Escanear QR Code",
-  "confirmSendTitle": "Confirm Send",
-  "confirmSendDescription": "Transactions are irreversible, so make sure that these details match exactly."
+  "confirmSendTitle": "Confirmar Envio",
+  "confirmSendDescription": "As transações são irreversíveis, então certifique-se de que estes detalhes correspondem exatamente.",
+  "addressBookTitle": "Lista de Contatos",
+  "addressBookAddContact": "Adicionar Contato",
+  "addressBookEditContact": "Editar Contato",
+  "addressBookDeleteContact": "Excluir Contato",
+  "addressBookDeleteContactConfirmation": "Tem certeza que deseja excluir \"{contactName}\"?",
+  "@addressBookDeleteContactConfirmation": {
+    "placeholders": {
+      "contactName": {
+        "type": "String"
+      }
+    }
+  },
+  "addressBookDelete": "Excluir",
+  "addressBookSearchHint": "Pesquisar contatos...",
+  "addressBookNoContacts": "Nenhum contato ainda",
+  "addressBookNoContactsDescription": "Adicione seu primeiro contato tocando no botão +",
+  "addressBookNoSearchResults": "Nenhum contato encontrado",
+  "addressBookCopyAddress": "Copiar Endereço",
+  "addressBookEdit": "Editar",
+  "addressBookContactName": "Nome do Contato",
+  "addressBookUpdate": "Atualizar",
+  "addressBookSave": "Salvar",
+  "addressBookAddressCopied": "Endereço copiado para a área de transferência",
+  "sendSelectFromAddressBook": "Selecionar da Lista de Contatos",
+  "sendSelectedContact": "Contato selecionado",
+  "sendClearSelectedContact": "Limpar contato selecionado",
+  "sendEditAddress": "Editar Endereço"
 }
diff --git a/lib/main.dart b/lib/main.dart
index 9357539..fe8817d 100644
--- a/lib/main.dart
+++ b/lib/main.dart
@@ -9,6 +9,7 @@ import 'package:shared_preferences/shared_preferences.dart';
 import 'package:timeago/timeago.dart' as timeago;
 
 import 'package:skylight_wallet/models/fiat_rate_model.dart';
+import 'package:skylight_wallet/models/contact_model.dart';
 import 'package:skylight_wallet/screens/confirm_send.dart';
 import 'package:skylight_wallet/screens/lws_details.dart';
 import 'package:skylight_wallet/screens/lws_keys.dart';
@@ -30,6 +31,7 @@ import 'package:skylight_wallet/screens/restore_wallet.dart';
 import 'package:skylight_wallet/screens/restore_warning.dart';
 import 'package:skylight_wallet/screens/wallet_home.dart';
 import 'package:skylight_wallet/screens/welcome.dart';
+import 'package:skylight_wallet/screens/address_book.dart';
 import 'package:skylight_wallet/util/logging.dart';
 
 void main() async {
@@ -63,6 +65,7 @@ class MyApp extends StatelessWidget {
         ChangeNotifierProvider(create: (context) => LanguageModel()),
         ChangeNotifierProvider(create: (context) => ThemeModel()),
         ChangeNotifierProvider(create: (context) => FiatRateModel()),
+        ChangeNotifierProvider(create: (context) => ContactModel()),
       ],
       child: Consumer2<LanguageModel, ThemeModel>(
         builder: (context, languageProvider, themeProvider, child) {
@@ -147,6 +150,7 @@ class MyApp extends StatelessWidget {
                     '/scan_qr': (context) => ScanQrScreen(),
                     '/receive': (context) => ReceiveScreen(),
                     '/tx_details': (context) => TxDetailsScreen(),
+                    '/address_book': (context) => AddressBookScreen(),
                     '/terms_of_service': (context) => TermsOfService(),
                     '/privacy_policy': (context) => PrivacyPolicy(),
                   },
diff --git a/lib/models/contact_model.dart b/lib/models/contact_model.dart
new file mode 100644
index 0000000..7c493d5
--- /dev/null
+++ b/lib/models/contact_model.dart
@@ -0,0 +1,116 @@
+import 'dart:convert';
+import 'package:flutter/foundation.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+import 'package:skylight_wallet/services/shared_preferences_service.dart';
+
+class Contact {
+  final String id;
+  final String name;
+  final String address;
+
+  Contact({required this.id, required this.name, required this.address});
+
+  Map<String, dynamic> toJson() => {'id': id, 'name': name, 'address': address};
+
+  factory Contact.fromJson(Map<String, dynamic> json) => Contact(
+    id: json['id'] as String,
+    name: json['name'] as String,
+    address: json['address'] as String,
+  );
+
+  Contact copyWith({String? id, String? name, String? address}) {
+    return Contact(
+      id: id ?? this.id,
+      name: name ?? this.name,
+      address: address ?? this.address,
+    );
+  }
+}
+
+class ContactModel with ChangeNotifier {
+  List<Contact> _contacts = [];
+
+  List<Contact> get contacts => List.unmodifiable(_contacts);
+
+  ContactModel() {
+    _loadContacts();
+  }
+
+  Future<void> _loadContacts() async {
+    try {
+      final prefs = await SharedPreferences.getInstance();
+      final contactsJson =
+          prefs.getStringList(SharedPreferencesKeys.contacts) ?? [];
+
+      _contacts = contactsJson
+          .map(
+            (jsonString) => Contact.fromJson(
+              json.decode(jsonString) as Map<String, dynamic>,
+            ),
+          )
+          .toList();
+
+      notifyListeners();
+    } catch (e) {
+      debugPrint('Error loading contacts: $e');
+    }
+  }
+
+  Future<void> _saveContacts() async {
+    try {
+      final prefs = await SharedPreferences.getInstance();
+      final contactsJson = _contacts
+          .map((contact) => json.encode(contact.toJson()))
+          .toList();
+
+      await prefs.setStringList(SharedPreferencesKeys.contacts, contactsJson);
+    } catch (e) {
+      debugPrint('Error saving contacts: $e');
+    }
+  }
+
+  Future<void> addContact(String name, String address) async {
+    final id = DateTime.now().millisecondsSinceEpoch.toString();
+    final contact = Contact(id: id, name: name.trim(), address: address.trim());
+
+    _contacts.add(contact);
+    await _saveContacts();
+    notifyListeners();
+  }
+
+  Future<void> updateContact(String id, String name, String address) async {
+    final index = _contacts.indexWhere((contact) => contact.id == id);
+    if (index != -1) {
+      _contacts[index] = _contacts[index].copyWith(
+        name: name.trim(),
+        address: address.trim(),
+      );
+      await _saveContacts();
+      notifyListeners();
+    }
+  }
+
+  Future<void> deleteContact(String id) async {
+    _contacts.removeWhere((contact) => contact.id == id);
+    await _saveContacts();
+    notifyListeners();
+  }
+
+  Contact? getContactById(String id) {
+    try {
+      return _contacts.firstWhere((contact) => contact.id == id);
+    } catch (e) {
+      return null;
+    }
+  }
+
+  List<Contact> searchContacts(String query) {
+    if (query.isEmpty) return _contacts;
+
+    final lowercaseQuery = query.toLowerCase();
+    return _contacts.where((contact) {
+      return contact.name.toLowerCase().contains(lowercaseQuery) ||
+          contact.address.toLowerCase().contains(lowercaseQuery);
+    }).toList();
+  }
+}
diff --git a/lib/screens/address_book.dart b/lib/screens/address_book.dart
new file mode 100644
index 0000000..fdc6fde
--- /dev/null
+++ b/lib/screens/address_book.dart
@@ -0,0 +1,426 @@
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+import 'package:provider/provider.dart';
+import 'package:monero/monero.dart' as monero;
+import 'package:skylight_wallet/l10n/app_localizations.dart';
+import 'package:skylight_wallet/models/contact_model.dart';
+import 'package:skylight_wallet/widgets/wallet_navigation_bar.dart';
+
+class AddressBookScreen extends StatefulWidget {
+  const AddressBookScreen({super.key});
+
+  @override
+  State<AddressBookScreen> createState() => _AddressBookScreenState();
+}
+
+class _AddressBookScreenState extends State<AddressBookScreen> {
+  final TextEditingController _searchController = TextEditingController();
+  String _searchQuery = '';
+
+  @override
+  void dispose() {
+    _searchController.dispose();
+    super.dispose();
+  }
+
+  void _onSearchChanged(String query) {
+    setState(() {
+      _searchQuery = query;
+    });
+  }
+
+  void _showAddContactDialog() {
+    showDialog(context: context, builder: (context) => _ContactDialog());
+  }
+
+  void _showEditContactDialog(Contact contact) {
+    showDialog(
+      context: context,
+      builder: (context) => _ContactDialog(contact: contact),
+    );
+  }
+
+  void _showDeleteContactDialog(Contact contact) {
+    final i18n = AppLocalizations.of(context)!;
+
+    showDialog(
+      context: context,
+      builder: (context) => AlertDialog(
+        title: Text(i18n.addressBookDeleteContact),
+        content: Text(i18n.addressBookDeleteContactConfirmation(contact.name)),
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.of(context).pop(),
+            child: Text(i18n.cancel),
+          ),
+          FilledButton(
+            onPressed: () {
+              Provider.of<ContactModel>(
+                context,
+                listen: false,
+              ).deleteContact(contact.id);
+              Navigator.of(context).pop();
+            },
+            child: Text(i18n.addressBookDelete),
+          ),
+        ],
+      ),
+    );
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final i18n = AppLocalizations.of(context)!;
+
+    return Scaffold(
+      appBar: AppBar(
+        title: Text(i18n.addressBookTitle),
+        actions: [
+          IconButton(
+            onPressed: _showAddContactDialog,
+            icon: Icon(Icons.add),
+            tooltip: i18n.addressBookAddContact,
+          ),
+        ],
+      ),
+      bottomNavigationBar: WalletNavigationBar(selectedIndex: 1),
+      body: Column(
+        children: [
+          Padding(
+            padding: EdgeInsets.all(16.0),
+            child: TextField(
+              controller: _searchController,
+              onChanged: _onSearchChanged,
+              decoration: InputDecoration(
+                hintText: i18n.addressBookSearchHint,
+                prefixIcon: Icon(Icons.search),
+                border: OutlineInputBorder(
+                  borderRadius: BorderRadius.circular(8.0),
+                ),
+              ),
+            ),
+          ),
+          Expanded(
+            child: Consumer<ContactModel>(
+              builder: (context, contactModel, child) {
+                final filteredContacts = contactModel.searchContacts(
+                  _searchQuery,
+                );
+
+                if (filteredContacts.isEmpty) {
+                  return Center(
+                    child: Column(
+                      mainAxisAlignment: MainAxisAlignment.center,
+                      children: [
+                        Icon(
+                          Icons.contacts_outlined,
+                          size: 64,
+                          color: Theme.of(context).colorScheme.outline,
+                        ),
+                        SizedBox(height: 16),
+                        Text(
+                          _searchQuery.isEmpty
+                              ? i18n.addressBookNoContacts
+                              : i18n.addressBookNoSearchResults,
+                          style: Theme.of(context).textTheme.bodyLarge
+                              ?.copyWith(
+                                color: Theme.of(context).colorScheme.outline,
+                              ),
+                        ),
+                        if (_searchQuery.isEmpty) ...[
+                          SizedBox(height: 8),
+                          Text(
+                            i18n.addressBookNoContactsDescription,
+                            style: Theme.of(context).textTheme.bodyMedium
+                                ?.copyWith(
+                                  color: Theme.of(context).colorScheme.outline,
+                                ),
+                            textAlign: TextAlign.center,
+                          ),
+                        ],
+                      ],
+                    ),
+                  );
+                }
+
+                return ListView.builder(
+                  itemCount: filteredContacts.length,
+                  itemBuilder: (context, index) {
+                    final contact = filteredContacts[index];
+                    return _ContactListItem(
+                      contact: contact,
+                      onEdit: () => _showEditContactDialog(contact),
+                      onDelete: () => _showDeleteContactDialog(contact),
+                    );
+                  },
+                );
+              },
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+}
+
+class _ContactListItem extends StatelessWidget {
+  final Contact contact;
+  final VoidCallback onEdit;
+  final VoidCallback onDelete;
+
+  const _ContactListItem({
+    required this.contact,
+    required this.onEdit,
+    required this.onDelete,
+  });
+
+  void _copyAddressToClipboard(BuildContext context) {
+    final i18n = AppLocalizations.of(context)!;
+
+    Clipboard.setData(ClipboardData(text: contact.address));
+
+    ScaffoldMessenger.of(
+      context,
+    ).showSnackBar(SnackBar(content: Text(i18n.addressBookAddressCopied)));
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final i18n = AppLocalizations.of(context)!;
+
+    return Card(
+      margin: EdgeInsets.symmetric(horizontal: 16.0, vertical: 4.0),
+      child: ListTile(
+        leading: CircleAvatar(
+          backgroundColor: Theme.of(context).colorScheme.primary,
+          child: Text(
+            contact.name.isNotEmpty ? contact.name[0].toUpperCase() : '?',
+            style: TextStyle(
+              color: Theme.of(context).colorScheme.onPrimary,
+              fontWeight: FontWeight.bold,
+            ),
+          ),
+        ),
+        title: Text(
+          contact.name,
+          style: TextStyle(fontWeight: FontWeight.w500),
+        ),
+        subtitle: Text(
+          contact.address,
+          style: TextStyle(fontFamily: 'monospace', fontSize: 12),
+          maxLines: 2,
+          overflow: TextOverflow.ellipsis,
+        ),
+        trailing: PopupMenuButton<String>(
+          onSelected: (value) {
+            switch (value) {
+              case 'copy':
+                _copyAddressToClipboard(context);
+                break;
+              case 'edit':
+                onEdit();
+                break;
+              case 'delete':
+                onDelete();
+                break;
+            }
+          },
+          itemBuilder: (context) => [
+            PopupMenuItem(
+              value: 'copy',
+              child: Row(
+                children: [
+                  Icon(Icons.copy),
+                  SizedBox(width: 8),
+                  Text(i18n.addressBookCopyAddress),
+                ],
+              ),
+            ),
+            PopupMenuItem(
+              value: 'edit',
+              child: Row(
+                children: [
+                  Icon(Icons.edit),
+                  SizedBox(width: 8),
+                  Text(i18n.addressBookEdit),
+                ],
+              ),
+            ),
+            PopupMenuItem(
+              value: 'delete',
+              child: Row(
+                children: [
+                  Icon(Icons.delete, color: Colors.red),
+                  SizedBox(width: 8),
+                  Text(
+                    i18n.addressBookDelete,
+                    style: TextStyle(color: Colors.red),
+                  ),
+                ],
+              ),
+            ),
+          ],
+        ),
+        onTap: () => _copyAddressToClipboard(context),
+      ),
+    );
+  }
+}
+
+class _ContactDialog extends StatefulWidget {
+  final Contact? contact;
+
+  const _ContactDialog({this.contact});
+
+  @override
+  State<_ContactDialog> createState() => _ContactDialogState();
+}
+
+class _ContactDialogState extends State<_ContactDialog> {
+  final _formKey = GlobalKey<FormState>();
+  final _nameController = TextEditingController();
+  final _addressController = TextEditingController();
+  bool _isLoading = false;
+
+  @override
+  void initState() {
+    super.initState();
+    if (widget.contact != null) {
+      _nameController.text = widget.contact!.name;
+      _addressController.text = widget.contact!.address;
+    }
+  }
+
+  @override
+  void dispose() {
+    _nameController.dispose();
+    _addressController.dispose();
+    super.dispose();
+  }
+
+  String? _validateName(String? value) {
+    final i18n = AppLocalizations.of(context)!;
+    if (value == null || value.trim().isEmpty) {
+      return i18n.fieldEmptyError;
+    }
+    return null;
+  }
+
+  String? _validateAddress(String? value) {
+    final i18n = AppLocalizations.of(context)!;
+
+    if (value == null || value.trim().isEmpty) {
+      return i18n.fieldEmptyError;
+    }
+
+    // ignore: deprecated_member_use
+    if (!monero.Wallet_addressValid(value.trim(), 0)) {
+      return i18n.sendInvalidAddressError;
+    }
+    return null;
+  }
+
+  Future<void> _saveContact() async {
+    final i18n = AppLocalizations.of(context)!;
+    if (!_formKey.currentState!.validate()) return;
+
+    setState(() {
+      _isLoading = true;
+    });
+
+    try {
+      final contactModel = Provider.of<ContactModel>(context, listen: false);
+
+      if (widget.contact == null) {
+        await contactModel.addContact(
+          _nameController.text.trim(),
+          _addressController.text.trim(),
+        );
+      } else {
+        await contactModel.updateContact(
+          widget.contact!.id,
+          _nameController.text.trim(),
+          _addressController.text.trim(),
+        );
+      }
+
+      if (mounted) {
+        Navigator.of(context).pop();
+      }
+    } catch (e) {
+      if (mounted) {
+        ScaffoldMessenger.of(context).showSnackBar(
+          SnackBar(
+            content: Text(i18n.unknownError),
+            backgroundColor: Colors.red,
+          ),
+        );
+      }
+    } finally {
+      if (mounted) {
+        setState(() {
+          _isLoading = false;
+        });
+      }
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final i18n = AppLocalizations.of(context)!;
+    final isEditing = widget.contact != null;
+
+    return AlertDialog(
+      title: Text(
+        isEditing ? i18n.addressBookEditContact : i18n.addressBookAddContact,
+      ),
+      content: Form(
+        key: _formKey,
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            TextFormField(
+              controller: _nameController,
+              decoration: InputDecoration(
+                labelText: i18n.addressBookContactName,
+                border: OutlineInputBorder(
+                  borderRadius: BorderRadius.circular(8.0),
+                ),
+              ),
+              validator: _validateName,
+              textCapitalization: TextCapitalization.words,
+            ),
+            SizedBox(height: 16),
+            TextFormField(
+              controller: _addressController,
+              decoration: InputDecoration(
+                labelText: i18n.address,
+                border: OutlineInputBorder(
+                  borderRadius: BorderRadius.circular(8.0),
+                ),
+              ),
+              validator: _validateAddress,
+              maxLines: 3,
+            ),
+          ],
+        ),
+      ),
+      actions: [
+        TextButton(
+          onPressed: _isLoading ? null : () => Navigator.of(context).pop(),
+          child: Text(i18n.cancel),
+        ),
+        FilledButton(
+          onPressed: _isLoading ? null : _saveContact,
+          child: _isLoading
+              ? SizedBox(
+                  width: 16,
+                  height: 16,
+                  child: CircularProgressIndicator(strokeWidth: 2),
+                )
+              : Text(isEditing ? i18n.addressBookUpdate : i18n.addressBookSave),
+        ),
+      ],
+    );
+  }
+}
diff --git a/lib/screens/confirm_send.dart b/lib/screens/confirm_send.dart
index 69cd0dc..03adbeb 100644
--- a/lib/screens/confirm_send.dart
+++ b/lib/screens/confirm_send.dart
@@ -10,13 +10,15 @@ import 'package:provider/provider.dart';
 
 class ConfirmSendScreenArgs {
   MoneroPendingTransaction tx;
-  String? destinationOpenAlias;
   String destinationAddress;
+  String? destinationOpenAlias;
+  String? destinationContactName;
 
   ConfirmSendScreenArgs({
     required this.tx,
     required this.destinationAddress,
     this.destinationOpenAlias,
+    this.destinationContactName,
   });
 }
 
@@ -35,6 +37,7 @@ class _ConfirmSendScreenState extends State<ConfirmSendScreen> {
   String? _destinationOpenAlias;
   String _destinationAddress = '';
   List<String> _destinationAddressSliced = [];
+  String? _destinationContactName;
 
   @override
   void initState() {
@@ -63,6 +66,7 @@ class _ConfirmSendScreenState extends State<ConfirmSendScreen> {
       _destinationOpenAlias = args.destinationOpenAlias;
       _destinationAddress = args.destinationAddress;
       _destinationAddressSliced = _sliceAddress(args.destinationAddress);
+      _destinationContactName = args.destinationContactName;
     });
   }
 
@@ -227,31 +231,40 @@ class _ConfirmSendScreenState extends State<ConfirmSendScreen> {
                 ),
 
                 Expanded(
-                  child: Container(
-                    margin: EdgeInsetsGeometry.only(left: 40),
-                    child: Wrap(
-                      spacing: 4,
-                      alignment: WrapAlignment.end,
-                      children: _destinationAddressSliced
-                          .asMap()
-                          .entries
-                          .map(
-                            (item) => Text(
-                              item.value,
-                              style: TextStyle(
-                                fontFamily: 'monospace',
-                                // highlight start and end slices of address
-                                fontWeight:
-                                    item.key == 0 ||
-                                        item.key ==
-                                            _destinationAddressSliced.length - 1
-                                    ? FontWeight.w700
-                                    : FontWeight.w300,
-                              ),
-                            ),
-                          )
-                          .toList(),
-                    ),
+                  child: Column(
+                    crossAxisAlignment: CrossAxisAlignment.end,
+                    children: [
+                      Container(
+                        margin: EdgeInsetsGeometry.only(left: 40),
+                        child: Wrap(
+                          spacing: 4,
+                          alignment: WrapAlignment.end,
+                          children: _destinationAddressSliced
+                              .asMap()
+                              .entries
+                              .map(
+                                (item) => Text(
+                                  item.value,
+                                  style: TextStyle(
+                                    fontFamily: 'monospace',
+                                    // highlight start and end slices of address
+                                    fontWeight:
+                                        item.key == 0 ||
+                                            item.key ==
+                                                _destinationAddressSliced
+                                                        .length -
+                                                    1
+                                        ? FontWeight.w700
+                                        : FontWeight.w300,
+                                  ),
+                                ),
+                              )
+                              .toList(),
+                        ),
+                      ),
+                      if (_destinationContactName is String)
+                        Text('($_destinationContactName)'),
+                    ],
                   ),
                 ),
               ],
diff --git a/lib/screens/send.dart b/lib/screens/send.dart
index acc28ba..89918d7 100644
--- a/lib/screens/send.dart
+++ b/lib/screens/send.dart
@@ -6,6 +6,7 @@ import 'package:skylight_wallet/l10n/app_localizations.dart';
 import 'package:skylight_wallet/screens/confirm_send.dart';
 import 'package:skylight_wallet/widgets/monero_amount.dart';
 import 'package:skylight_wallet/models/wallet_model.dart';
+import 'package:skylight_wallet/models/contact_model.dart';
 
 class SendScreenArgs {
   String destinationAddress;
@@ -26,12 +27,14 @@ class _SendScreenState extends State<SendScreen> {
   final _destinationAddressController = TextEditingController(text: '');
   final _amountController = TextEditingController(text: '');
   bool _isSweepAll = false;
+  Contact? _selectedContact;
 
   String _destinationAddressError = '';
   String _amountError = '';
 
   @override
   void dispose() {
+    _destinationAddressController.removeListener(_onAddressChanged);
     _destinationAddressController.dispose();
     _amountController.dispose();
     super.dispose();
@@ -42,6 +45,17 @@ class _SendScreenState extends State<SendScreen> {
     super.didChangeDependencies();
 
     _loadFormFromArgs();
+    _destinationAddressController.addListener(_onAddressChanged);
+  }
+
+  void _onAddressChanged() {
+    // Clear selected contact if user manually types in address field
+    if (_selectedContact != null &&
+        _destinationAddressController.text != _selectedContact!.address) {
+      setState(() {
+        _selectedContact = null;
+      });
+    }
   }
 
   void _loadFormFromArgs() {
@@ -63,6 +77,29 @@ class _SendScreenState extends State<SendScreen> {
     }
   }
 
+  void _showContactPicker() {
+    showDialog(
+      context: context,
+      builder: (context) => _ContactPickerDialog(
+        onContactSelected: (contact) {
+          setState(() {
+            _selectedContact = contact;
+            _destinationAddressController.text = contact.address;
+          });
+          Navigator.of(context).pop();
+        },
+      ),
+    );
+  }
+
+  void _clearSelectedContact() {
+    _destinationAddressController.text = '';
+
+    setState(() {
+      _selectedContact = null;
+    });
+  }
+
   Future<void> _send() async {
     final amount = double.parse(_amountController.text);
 
@@ -132,6 +169,7 @@ class _SendScreenState extends State<SendScreen> {
             tx: tx,
             destinationAddress: destinationAddress,
             destinationOpenAlias: destinationOpenAlias,
+            destinationContactName: _selectedContact?.name,
           ),
         );
       }
@@ -199,32 +237,107 @@ class _SendScreenState extends State<SendScreen> {
             mainAxisAlignment: MainAxisAlignment.center,
             spacing: 20,
             children: [
-              TextField(
-                controller: _destinationAddressController,
-                maxLines: null,
-                decoration: InputDecoration(
-                  labelText: i18n.address,
-                  border: OutlineInputBorder(),
-                  errorText: _destinationAddressError != ''
-                      ? _destinationAddressError
-                      : null,
-                  suffixIcon: Row(
-                    spacing: 0,
-                    mainAxisSize: MainAxisSize.min,
-                    children: [
-                      IconButton(
-                        onPressed: _pasteAddressFromClipboard,
-                        icon: Icon(Icons.paste),
+              if (_selectedContact == null)
+                TextField(
+                  controller: _destinationAddressController,
+                  maxLines: null,
+                  decoration: InputDecoration(
+                    labelText: i18n.address,
+                    border: OutlineInputBorder(),
+                    errorText: _destinationAddressError != ''
+                        ? _destinationAddressError
+                        : null,
+                    suffixIcon: Container(
+                      margin: EdgeInsets.only(right: 14),
+                      child: Row(
+                        spacing: 16,
+                        mainAxisSize: MainAxisSize.min,
+                        children: [
+                          GestureDetector(
+                            onTap: _pasteAddressFromClipboard,
+                            child: Icon(Icons.paste),
+                          ),
+                          GestureDetector(
+                            onTap: () =>
+                                Navigator.pushNamed(context, '/scan_qr'),
+                            child: Icon(Icons.qr_code),
+                          ),
+                          GestureDetector(
+                            onTap: _showContactPicker,
+                            child: Icon(Icons.contacts_outlined),
+                          ),
+                        ],
                       ),
-                      IconButton(
-                        onPressed: () =>
-                            Navigator.pushNamed(context, '/scan_qr'),
-                        icon: Icon(Icons.qr_code),
+                    ),
+                  ),
+                ),
+              if (_selectedContact != null)
+                Container(
+                  width: double.infinity,
+                  padding: EdgeInsets.all(12),
+                  decoration: BoxDecoration(
+                    color: Theme.of(context).colorScheme.primaryContainer,
+                    borderRadius: BorderRadius.circular(8),
+                    border: Border.all(
+                      color: Theme.of(
+                        context,
+                      ).colorScheme.outline.withValues(alpha: 0.2),
+                    ),
+                  ),
+                  child: Column(
+                    children: [
+                      Row(
+                        children: [
+                          CircleAvatar(
+                            radius: 16,
+                            backgroundColor: Theme.of(
+                              context,
+                            ).colorScheme.primary,
+                            child: Text(
+                              _selectedContact!.name.isNotEmpty
+                                  ? _selectedContact!.name[0].toUpperCase()
+                                  : '?',
+                              style: TextStyle(
+                                color: Theme.of(context).colorScheme.onPrimary,
+                                fontWeight: FontWeight.bold,
+                                fontSize: 14,
+                              ),
+                            ),
+                          ),
+                          SizedBox(width: 12),
+                          Expanded(
+                            child: Column(
+                              crossAxisAlignment: CrossAxisAlignment.start,
+                              children: [
+                                Text(
+                                  _selectedContact!.name,
+                                  style: TextStyle(
+                                    fontWeight: FontWeight.w500,
+                                    fontSize: 16,
+                                  ),
+                                ),
+                                Text(
+                                  i18n.sendSelectedContact,
+                                  style: TextStyle(
+                                    fontSize: 12,
+                                    color: Theme.of(
+                                      context,
+                                    ).colorScheme.onSurfaceVariant,
+                                  ),
+                                ),
+                              ],
+                            ),
+                          ),
+                          IconButton(
+                            onPressed: _clearSelectedContact,
+                            icon: Icon(Icons.close, size: 20),
+                            tooltip: i18n.sendClearSelectedContact,
+                          ),
+                        ],
                       ),
                     ],
                   ),
                 ),
-              ),
               Column(
                 spacing: 10,
                 children: [
@@ -312,3 +425,123 @@ class _SendScreenState extends State<SendScreen> {
     );
   }
 }
+
+class _ContactPickerDialog extends StatefulWidget {
+  final Function(Contact) onContactSelected;
+
+  const _ContactPickerDialog({required this.onContactSelected});
+
+  @override
+  State<_ContactPickerDialog> createState() => _ContactPickerDialogState();
+}
+
+class _ContactPickerDialogState extends State<_ContactPickerDialog> {
+  final TextEditingController _searchController = TextEditingController();
+  String _searchQuery = '';
+
+  @override
+  void dispose() {
+    _searchController.dispose();
+    super.dispose();
+  }
+
+  void _onSearchChanged(String query) {
+    setState(() {
+      _searchQuery = query;
+    });
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final i18n = AppLocalizations.of(context)!;
+
+    return AlertDialog(
+      title: Text(i18n.sendSelectFromAddressBook),
+      content: SizedBox(
+        width: double.maxFinite,
+        height: 400,
+        child: Column(
+          children: [
+            TextField(
+              controller: _searchController,
+              onChanged: _onSearchChanged,
+              decoration: InputDecoration(
+                hintText: i18n.addressBookSearchHint,
+                prefixIcon: Icon(Icons.search),
+                border: OutlineInputBorder(
+                  borderRadius: BorderRadius.circular(8.0),
+                ),
+              ),
+            ),
+            SizedBox(height: 16),
+            Expanded(
+              child: Consumer<ContactModel>(
+                builder: (context, contactModel, child) {
+                  final filteredContacts = contactModel.searchContacts(
+                    _searchQuery,
+                  );
+
+                  if (filteredContacts.isEmpty) {
+                    return Center(
+                      child: Text(
+                        _searchQuery.isEmpty
+                            ? i18n.addressBookNoContacts
+                            : i18n.addressBookNoSearchResults,
+                        style: Theme.of(context).textTheme.bodyLarge?.copyWith(
+                          color: Theme.of(context).colorScheme.outline,
+                        ),
+                      ),
+                    );
+                  }
+
+                  return ListView.builder(
+                    itemCount: filteredContacts.length,
+                    itemBuilder: (context, index) {
+                      final contact = filteredContacts[index];
+                      return ListTile(
+                        leading: CircleAvatar(
+                          backgroundColor: Theme.of(
+                            context,
+                          ).colorScheme.primary,
+                          child: Text(
+                            contact.name.isNotEmpty
+                                ? contact.name[0].toUpperCase()
+                                : '?',
+                            style: TextStyle(
+                              color: Theme.of(context).colorScheme.onPrimary,
+                              fontWeight: FontWeight.bold,
+                            ),
+                          ),
+                        ),
+                        title: Text(
+                          contact.name,
+                          style: TextStyle(fontWeight: FontWeight.w500),
+                        ),
+                        subtitle: Text(
+                          contact.address,
+                          style: TextStyle(
+                            fontFamily: 'monospace',
+                            fontSize: 12,
+                          ),
+                          maxLines: 2,
+                          overflow: TextOverflow.ellipsis,
+                        ),
+                        onTap: () => widget.onContactSelected(contact),
+                      );
+                    },
+                  );
+                },
+              ),
+            ),
+          ],
+        ),
+      ),
+      actions: [
+        TextButton(
+          onPressed: () => Navigator.of(context).pop(),
+          child: Text(i18n.cancel),
+        ),
+      ],
+    );
+  }
+}
diff --git a/lib/screens/settings.dart b/lib/screens/settings.dart
index 7232df1..847ac6d 100644
--- a/lib/screens/settings.dart
+++ b/lib/screens/settings.dart
@@ -291,7 +291,7 @@ class _SettingsScreenState extends State<SettingsScreen> {
     final theme = context.watch<ThemeModel>();
 
     return Scaffold(
-      bottomNavigationBar: WalletNavigationBar(selectedIndex: 1),
+      bottomNavigationBar: WalletNavigationBar(selectedIndex: 2),
       appBar: AppBar(title: Text(i18n.settingsTitle)),
       body: Padding(
         padding: EdgeInsets.all(20),
diff --git a/lib/services/shared_preferences_service.dart b/lib/services/shared_preferences_service.dart
index 4509a27..e0b571f 100644
--- a/lib/services/shared_preferences_service.dart
+++ b/lib/services/shared_preferences_service.dart
@@ -16,6 +16,7 @@ class SharedPreferencesKeys {
   static const String walletRestoreHeight = 'walletRestoreHeight';
   static const String txHistoryCount = 'txHistoryCount';
   static const String pendingOutgoingTxs = 'pendingOutgoingTxs';
+  static const String contacts = 'contacts';
 }
 
 class SharedPreferencesService {
diff --git a/lib/widgets/wallet_navigation_bar.dart b/lib/widgets/wallet_navigation_bar.dart
index 95fdcbf..3f29ed8 100644
--- a/lib/widgets/wallet_navigation_bar.dart
+++ b/lib/widgets/wallet_navigation_bar.dart
@@ -14,13 +14,18 @@ class WalletNavigationBar extends StatelessWidget {
       selectedIndex: selectedIndex,
       onDestinationSelected: (index) => {
         if (index == 0) {Navigator.pushNamed(context, '/wallet_home')},
-        if (index == 1) {Navigator.pushNamed(context, '/settings')},
+        if (index == 1) {Navigator.pushNamed(context, '/address_book')},
+        if (index == 2) {Navigator.pushNamed(context, '/settings')},
       },
       destinations: [
         NavigationDestination(
           icon: Icon(Icons.wallet),
           label: i18n.navigationBarWallet,
         ),
+        NavigationDestination(
+          icon: Icon(Icons.contacts),
+          label: i18n.addressBookTitle,
+        ),
         NavigationDestination(
           icon: Icon(Icons.settings),
           label: i18n.navigationBarSettings,