Zulip combines the immediacy of real-time chat with an email threading model.

With Zulip, you can catch up on important conversations while ignoring irrelevant ones.

Apps for every platform.

Zulip has modern apps for every major platform, powered by Electron and React Native.

Open source.

Zulip is 100% open source software, built by a vibrant community of over 1000 developers from all around the world. With 160,000 words of developer documentation, a high quality code base, and a welcoming community, it’s easy to extend or tweak Zulip.