Supported platforms - Lark

Lark supports two ways to connect: the Lark SDK (a lightweight, purpose-built client) and the Firebase SDKs (drop-in compatibility with your existing Firebase code). You can also use the REST API from any language or platform.

Client SDKs

Platform	Lark SDK	Firebase SDK
JavaScript / TypeScript	Lark JS SDK	Firebase JS SDK
Android (Kotlin / Java)	—	Firebase Android SDK
iOS / Apple (Swift)	—	Firebase iOS SDK
Flutter (Dart)	—	Firebase Flutter SDK
C++	—	Firebase C++ SDK
Unity (C#)	—	Firebase Unity SDK

REST API

The REST API works from any language or platform that can make HTTP requests: Python, Ruby, Go, Java, shell scripts, serverless functions, or anything else. It’s 100% compatible with the Firebase Realtime Database REST API.

How to choose

If you’re building a JavaScript / TypeScript app, the Lark SDK is the best choice. It’s smaller (~20KB), supports WebTransport for lower latency, and has built-in support for volatile paths. If you’re migrating an existing Firebase app, the Firebase JS SDK works too. Just change the URL.
For mobile or game engines, use the Firebase SDK for your platform. Change the database URL and everything works.
For server-side or scripting, use the REST API. No SDK needed.

What’s next

Quickstart

Create a project and build your first real-time app in minutes.

Platform concepts

Understand Lark’s data model, security rules, and real-time features.