MMKV vs Realm

Developers should use MMKV when building mobile apps that require fast, reliable, and lightweight local storage for user preferences, settings, or small datasets, especially on Android where it outperforms SharedPreferences in speed and efficiency meets developers should learn realm when building mobile apps that require high-performance local data storage with real-time updates, such as chat applications, collaborative tools, or offline-capable apps. Here's our take.

MMKV

Nice Pick

Developers should use MMKV when building mobile apps that require fast, reliable, and lightweight local storage for user preferences, settings, or small datasets, especially on Android where it outperforms SharedPreferences in speed and efficiency

Pros

• It's ideal for performance-critical applications, such as gaming or real-time apps, and for scenarios needing cross-platform consistency between Android and iOS, as it's available for both platforms
• Related to: android-development, ios-development

Cons

• Specific tradeoffs depend on your use case

Realm

Developers should learn Realm when building mobile apps that require high-performance local data storage with real-time updates, such as chat applications, collaborative tools, or offline-capable apps

Pros

• It's particularly useful for scenarios where complex object relationships need to be managed efficiently without manual SQL queries, and when seamless synchronization with a backend (via Realm Sync) is needed for multi-user experiences
• Related to: react-native, flutter

Cons

• Specific tradeoffs depend on your use case

The Verdict

These tools serve different purposes. MMKV is a library while Realm is a database. We picked MMKV based on overall popularity, but your choice depends on what you're building.

The Bottom Line

MMKV wins

Based on overall popularity. MMKV is more widely used, but Realm excels in its own space.