Welcome to the Realm Docs
Realm is a mobile-first database designed for modern, data-driven applications. You can use Realm to build mobile, web, desktop, and IoT apps.
Realm has open-source SDKs available for most popular languages, frameworks, and platforms. Each SDK is language-idiomatic and includes:
The core database APIs for creating and working with on-device databases.
The APIs you need for connecting to the App Services backend so you can make use of server-side features like Device Sync, Authentication, Functions, Triggers, and more.
Build applications in Swift or Objective-C for Apple platforms, including iOS, macOS, watchOS, and tvOS.
Build cross-platform applications for Android, iOS, and macOS with Kotlin Multiplatform Mobile. Realm data maps directly to the classes in your app.
Build applications that use C# and the .NET platform, including MAUI, Xamarin, native Windows applications, and Unity projects.
React Native SDK
Build Android applications in Java or Kotlin. Realm data maps directly to the classes in your app.
Build Flutter applications with Dart.
Build applications in C++. Access data stored in realms and sync data with Atlas.
Atlas App Services
Discover how to sync data, define permissions, and connect to other services, including MongoDB Atlas.
For legacy (pre-v10) Realm Database Documentation, see https://www.mongodb.com/docs/realm-legacy/docs/.