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facebook /flipper

A desktop debugging platform for mobile developers.

7.3K Stars 456 Forks Last release: 5 days ago (v0.49.0) MIT License 3.7K Commits 86 Releases

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Flipper (formerly Sonar) is a platform for debugging mobile apps on iOS and Android. Visualize, inspect, and control your apps from a simple desktop interface. Use Flipper as is or extend it using the plugin API.


Table of Contents

Mobile development

Flipper aims to be your number one companion for mobile app development on iOS and Android. Therefore, we provide a bunch of useful tools, including a log viewer, interactive layout inspector, and network inspector.

Extending Flipper

Flipper is built as a platform. In addition to using the tools already included, you can create your own plugins to visualize and debug data from your mobile apps. Flipper takes care of sending data back and forth, calling functions, and listening for events on the mobile app.

Contributing to Flipper

Both Flipper's desktop app and native mobile SDKs are open-source and MIT licensed. This enables you to see and understand how we are building plugins, and of course, join the community and help improve Flipper. We are excited to see what you will build on this platform.

In this repo

This repository includes all parts of Flipper. This includes:

  • Flipper's desktop app built using Electron (
  • native Flipper SDKs for iOS (
  • native Flipper SDKs for Android (
  • Plugins:
    • Logs (
    • Layout inspector (
    • Network inspector (
    • Shared Preferences/NSUserDefaults inspector (
  • website and documentation (

Getting started

Please refer to our Getting Started guide to set up Flipper.


  • node >= 8
  • yarn >= 1.5
  • iOS developer tools (for developing iOS plugins)
  • Android SDK and adb

Building from Source


Running from source

git clone cd flipper/desktop yarn yarn start

NOTE: If you're on Windows, you need to use Yarn 1.5.1 until this issue is resolved.

Building standalone application

Provide either






or any combination of them to

yarn build

to build a release zip file for the given platform(s). E.g.

yarn build --mac --version $buildNumber

You can find the resulting artifact in the



iOS SDK + Sample App

cd iOS/Sample rm -f Podfile.lock pod install --repo-update open Sample.xcworkspace<run app from xcode>

You can omit


to speed up the installation, but watch out as you may be building against outdated dependencies.

Android SDK + Sample app

Start up an android emulator and run the following in the project root:

./gradlew :sample:installDebug

React Native SDK + Sample app

cd react-native/ReactNativeFlipperExample yarn yarn android

Note that the first 2 steps need to be done only once.

Alternatively, the app can be started on


by running

yarn ios



Older yarn versions might show an error / hang with the message 'Waiting for the other yarn instance to finish'. If that happens, run the command


first separately in the directory




Find the full documentation for this project at

Our documentation is built with Docusaurus. You can build it locally by running this:

cd website yarn yarn start


See the CONTRIBUTING file for how to help out.


Flipper is MIT licensed, as found in the LICENSE file.

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