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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.

Get started with a tutorial

Read the 5 Minute Introduction

Realm landing page hero image

Realm is an embedded, object-oriented database that lets you build real-time, always-on applications. Its SDKs also provide access to Atlas App Services, a secure backend that can sync data between devices, authenticate and manage users, and run serverless JavaScript functions.

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.

Atlas App Services

Discover how to sync data, define permissions, and connect to other services, including MongoDB Atlas.

Learn more about Atlas App Services

Swift SDK icon

Swift SDK

Build applications in Swift or Objective-C for Apple platforms, including iOS, macOS, watchOS, and tvOS.

Kotlin SDK icon

Kotlin SDK

Build cross-platform applications for Android, iOS, and macOS with Kotlin Multiplatform (KMP). Realm data maps directly to the classes in your app.

.NET SDK icon


Build applications that use C# and the .NET platform, including MAUI, Xamarin, native Windows applications, and Unity projects.

Node.JS SDK icon

Node.js SDK

Use the Node.js SDK to build server and IoT applications in JavaScript or TypeScript.

React SDK icon

React Native SDK

Use the React Native SDK to build cross-platform applications in JavaScript or TypeScript.

Java SDK icon

Java SDK

Build Android applications in Java or Kotlin. Realm data maps directly to the classes in your app.

Web SDK icon


Build web applications in JavaScript or TypeScript. Access data with GraphQL and MongoDB queries.

Flutter SDK icon

Flutter SDK

Build Flutter applications with Dart.

C++ SDK icon


Build applications in C++. Access data stored in realms and sync data with Atlas.

For legacy (pre-v10) Realm Documentation, see

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