> ## Documentation Index
> Fetch the complete documentation index at: https://docs.larksh.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Supported platforms

> Every platform and SDK you can use to connect to 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](/lark-sdk/overview) | [Firebase JS SDK](/firebase/javascript)   |
| **Android** (Kotlin / Java) | —                                 | [Firebase Android SDK](/firebase/android) |
| **iOS / Apple** (Swift)     | —                                 | [Firebase iOS SDK](/firebase/ios)         |
| **Flutter** (Dart)          | —                                 | [Firebase Flutter SDK](/firebase/flutter) |
| **C++**                     | —                                 | [Firebase C++ SDK](/firebase/cpp)         |
| **Unity** (C#)              | —                                 | [Firebase Unity SDK](/firebase/unity)     |

## REST API

The [REST API](/rest-api/overview) 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](/lark-sdk/overview) 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](/firebase/javascript) works too. Just change the URL.
* For mobile or game engines, use the [Firebase SDK](/firebase/overview) for your platform. Change the database URL and everything works.
* For server-side or scripting, use the [REST API](/rest-api/overview). No SDK needed.

## What's next

<CardGroup cols={2}>
  <Card title="Quickstart" icon="rocket" href="/quickstart">
    Create a project and build your first real-time app in minutes.
  </Card>

  <Card title="Platform concepts" icon="layer-group" href="/platform/data-structure">
    Understand Lark's data model, security rules, and real-time features.
  </Card>
</CardGroup>