diff --git a/finlog_app/fluttery/lib/preferences/preferences.dart b/finlog_app/fluttery/lib/preferences/preferences.dart
new file mode 100644
index 0000000..f0b7585
--- /dev/null
+++ b/finlog_app/fluttery/lib/preferences/preferences.dart
@@ -0,0 +1,40 @@
+import 'package:fluttery/fluttery.dart';
+
+/// providing methods for managing persistent storage of key-value pairs.
+abstract class Preferences implements Service {
+  /// Stores a string value with the given [key].
+  Future<void> setString(String key, String value);
+
+  /// Retrieves the string value associated with the given [key].
+  Future<String?> getString(String key);
+
+  /// Stores an integer value with the given [key].
+  Future<void> setInt(String key, int value);
+
+  /// Retrieves the integer value associated with the given [key].
+  Future<int?> getInt(String key);
+
+  /// Stores a boolean value with the given [key].
+  Future<void> setBool(String key, bool value);
+
+  /// Retrieves the boolean value associated with the given [key].
+  Future<bool?> getBool(String key);
+
+  /// Stores a double value with the given [key].
+  Future<void> setDouble(String key, double value);
+
+  /// Retrieves the double value associated with the given [key].
+  Future<double?> getDouble(String key);
+
+  /// Stores a list of strings with the given [key].
+  Future<void> setStringList(String key, List<String> value);
+
+  /// Retrieves the list of strings associated with the given [key].
+  Future<List<String>?> getStringList(String key);
+
+  /// Removes the key-value pair associated with the given [key].
+  Future<void> remove(String key);
+
+  /// Clears all key-value pairs in the preferences.
+  Future<void> clear();
+}
diff --git a/finlog_app/fluttery/lib/src/preferences/preferences_impl.dart b/finlog_app/fluttery/lib/src/preferences/preferences_impl.dart
new file mode 100644
index 0000000..9b21f10
--- /dev/null
+++ b/finlog_app/fluttery/lib/src/preferences/preferences_impl.dart
@@ -0,0 +1,70 @@
+import 'package:flutter/material.dart';
+import 'package:fluttery/preferences/preferences.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+class PreferencesImpl implements Preferences {
+  final SharedPreferences _prefs;
+
+  /// Constructor
+  PreferencesImpl({required SharedPreferences instance}) : _prefs = instance;
+
+  @override
+  Future<void> setString(String key, String value) async {
+    await _prefs.setString(key, value);
+  }
+
+  @override
+  Future<String?> getString(String key) async {
+    return _prefs.getString(key);
+  }
+
+  @override
+  Future<void> setInt(String key, int value) async {
+    await _prefs.setInt(key, value);
+  }
+
+  @override
+  Future<int?> getInt(String key) async {
+    return _prefs.getInt(key);
+  }
+
+  @override
+  Future<void> setBool(String key, bool value) async {
+    await _prefs.setBool(key, value);
+  }
+
+  @override
+  Future<bool?> getBool(String key) async {
+    return _prefs.getBool(key);
+  }
+
+  @override
+  Future<void> setDouble(String key, double value) async {
+    await _prefs.setDouble(key, value);
+  }
+
+  @override
+  Future<double?> getDouble(String key) async {
+    return _prefs.getDouble(key);
+  }
+
+  @override
+  Future<void> setStringList(String key, List<String> value) async {
+    await _prefs.setStringList(key, value);
+  }
+
+  @override
+  Future<List<String>?> getStringList(String key) async {
+    return _prefs.getStringList(key);
+  }
+
+  @override
+  Future<void> remove(String key) async {
+    await _prefs.remove(key);
+  }
+
+  @override
+  Future<void> clear() async {
+    await _prefs.clear();
+  }
+}
diff --git a/finlog_app/fluttery/pubspec.yaml b/finlog_app/fluttery/pubspec.yaml
index 316de94..9493003 100644
--- a/finlog_app/fluttery/pubspec.yaml
+++ b/finlog_app/fluttery/pubspec.yaml
@@ -14,6 +14,7 @@ dependencies:
   kiwi: ^5.0.1
   logging: ^1.3.0
   mocktail: ^1.0.4
+  shared_preferences: ^2.5.3
 
 dev_dependencies:
   flutter_test:
diff --git a/finlog_app/fluttery/test/preferences/preferences_test.dart b/finlog_app/fluttery/test/preferences/preferences_test.dart
new file mode 100644
index 0000000..3ce409c
--- /dev/null
+++ b/finlog_app/fluttery/test/preferences/preferences_test.dart
@@ -0,0 +1,177 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:fluttery/src/preferences/preferences_impl.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+void main() {
+  late PreferencesImpl preferences;
+
+  setUp(() async {
+    // Clear any existing data and set up a fresh in-memory instance
+    SharedPreferences.setMockInitialValues({});
+
+    // Create preferences instance that will use the real SharedPreferences
+    // but with in-memory storage for testing
+    final sharedInstance = await SharedPreferences.getInstance();
+    preferences = PreferencesImpl(instance: sharedInstance);
+
+    // Give time for initialization
+    await Future.delayed(Duration.zero);
+  });
+
+  group('PreferencesImpl Tests', () {
+    test('setString and getString work with real implementation', () async {
+      const key = 'testKey';
+      const value = 'testValue';
+
+      await preferences.setString(key, value);
+      final result = await preferences.getString(key);
+
+      expect(result, value);
+    });
+
+    test('setInt and getInt work with real implementation', () async {
+      const key = 'testKey';
+      const value = 42;
+
+      await preferences.setInt(key, value);
+      final result = await preferences.getInt(key);
+
+      expect(result, value);
+    });
+
+    test('setBool and getBool work with real implementation', () async {
+      const key = 'testKey';
+      const value = true;
+
+      await preferences.setBool(key, value);
+      final result = await preferences.getBool(key);
+
+      expect(result, value);
+    });
+
+    test('setDouble and getDouble work with real implementation', () async {
+      const key = 'testKey';
+      const value = 3.14;
+
+      await preferences.setDouble(key, value);
+      final result = await preferences.getDouble(key);
+
+      expect(result, value);
+    });
+
+    test(
+      'setStringList and getStringList work with real implementation',
+      () async {
+        const key = 'testKey';
+        const value = ['one', 'two', 'three'];
+
+        await preferences.setStringList(key, value);
+        final result = await preferences.getStringList(key);
+
+        expect(result, value);
+      },
+    );
+
+    test('remove deletes key-value pair', () async {
+      const key = 'testKey';
+      const value = 'testValue';
+
+      // Set a value first
+      await preferences.setString(key, value);
+      expect(await preferences.getString(key), value);
+
+      // Remove it
+      await preferences.remove(key);
+      final result = await preferences.getString(key);
+
+      expect(result, isNull);
+    });
+
+    test('clear removes all data', () async {
+      // Set multiple values
+      await preferences.setString('key1', 'value1');
+      await preferences.setInt('key2', 42);
+      await preferences.setBool('key3', true);
+
+      // Verify they exist
+      expect(await preferences.getString('key1'), 'value1');
+      expect(await preferences.getInt('key2'), 42);
+      expect(await preferences.getBool('key3'), true);
+
+      // Clear all
+      await preferences.clear();
+
+      // Verify they're gone
+      expect(await preferences.getString('key1'), isNull);
+      expect(await preferences.getInt('key2'), isNull);
+      expect(await preferences.getBool('key3'), isNull);
+    });
+
+    test('getting non-existent keys returns null', () async {
+      expect(await preferences.getString('nonExistent'), isNull);
+      expect(await preferences.getInt('nonExistent'), isNull);
+      expect(await preferences.getBool('nonExistent'), isNull);
+      expect(await preferences.getDouble('nonExistent'), isNull);
+      expect(await preferences.getStringList('nonExistent'), isNull);
+    });
+
+    test('can overwrite existing values of the same type', () async {
+      const key = 'testKey';
+      const initialValue = 'initialValue';
+      const newValue = 'newValue';
+
+      await preferences.setString(key, initialValue);
+      expect(await preferences.getString(key), initialValue);
+
+      await preferences.setString(key, newValue);
+      expect(await preferences.getString(key), newValue);
+    });
+
+    test(
+      'different keys can store different data types simultaneously',
+      () async {
+        await preferences.setString('stringKey', 'value');
+        await preferences.setInt('intKey', 42);
+        await preferences.setBool('boolKey', true);
+        await preferences.setDouble('doubleKey', 3.14);
+        await preferences.setStringList('listKey', ['a', 'b', 'c']);
+
+        expect(await preferences.getString('stringKey'), 'value');
+        expect(await preferences.getInt('intKey'), 42);
+        expect(await preferences.getBool('boolKey'), true);
+        expect(await preferences.getDouble('doubleKey'), 3.14);
+        expect(await preferences.getStringList('listKey'), ['a', 'b', 'c']);
+      },
+    );
+
+    test('values can be overwritten with different data types', () async {
+      const key = 'testKey';
+
+      // Store a string value
+      await preferences.setString(key, 'stringValue');
+      expect(await preferences.getString(key), 'stringValue');
+
+      // Overwrite with an int - this replaces the string value
+      await preferences.setInt(key, 42);
+      expect(await preferences.getInt(key), 42);
+
+      // Overwrite with a bool - this replaces the int value
+      await preferences.setBool(key, true);
+      expect(await preferences.getBool(key), true);
+    });
+
+    test('persistence works across multiple operations', () async {
+      // Test that values persist through multiple set/get operations
+      await preferences.setString('key1', 'value1');
+      await preferences.setInt('key2', 100);
+
+      expect(await preferences.getString('key1'), 'value1');
+      expect(await preferences.getInt('key2'), 100);
+
+      // Modify one value and ensure the other remains
+      await preferences.setString('key1', 'newValue1');
+      expect(await preferences.getString('key1'), 'newValue1');
+      expect(await preferences.getInt('key2'), 100);
+    });
+  });
+}