shared_preferences

• Stores key-value database in the device

• Similar to localstorage and sqflite

• Wraps platform-specific persistent storage for simple data

• NSUserDefaults on iOS and macOS,
• SharedPreferences on Android, etc
• Data may be persisted to disk asynchronously, and there is no guarantee that writes will be persisted to disk after returning
• Supported data types: int, double, bool, String and List<String>