Zulip

Zulip: Open-source team live-chat with topic-based threading

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.

In Zulip, you subscribe to streams. Streams are like channels in Slack or IRC.

Each stream message also has a topic. Topics are unique to Zulip.

Messages in Zulip retain their context even if they’re sent hours after the conversation started:

Zulip Free is free for an unlimited number of users.

Zulip is 100% open source software, built by a vibrant community of over 1000 developers from all around the world.

Zulip has a significantly larger and more active development community than other modern open source group chat solutions like Mattermost, Rocket.Chat, and matrix.org.

Zulip’s unique threading saves me well over an hour a day in working with our distributed team of engineers and PMs across 7+ time zones. We tried Slack, Mattermost, and other team chat products that claim to support threading, and nothing handles synchronous and asynchronous communication so intuitively. Jacinda Shelly, CTO, Doctor on Demand

Why Zulip? Efficient communication with organized team chat.

Choosing the right tools for efficient communication can provide a massive productivity boost. Communication consumes a huge fraction of time in an organization

We created Zulip to empower teams to collaborate effectively, so that they can accomplish amazing things together

Zulip’s unique topic-based threading model makes efficient communication possible. Here’s how.

In Zulip, channels determine who gets a message. Each conversation within a channel is labeled with a topic, which keeps everything organized

If anything is out of place, it’s easy to move messages, rename and split topics, or even move a topic to a different channel

Find the conversations that matter to you.

Never miss an important message. New messages will pop a long-running thread to the top, rather than languishing in a forgotten sidebar

With organized team chat that is designed for both synchronous and asynchronous communication, everyone can be included in decision-making without being online at the same time

With an integrated communication hub that works great for everything from quick check-ins to collaborating on the most challenging problems, you can make decisions without the inefficiency of time-consuming group meetings, chaotic chat channels

GitHub - zulip/zulip: Zulip server and web application. Open-source team chat that helps teams stay productive and focused.

Zulip is an open-source team collaboration tool with unique topic-based threading that combines the best of email and chat to make remote work productive and delightful

Zulip is the only modern team chat app that is designed for both live and asynchronous conversations.

Contributing guide — Zulip 9.0-dev+git documentation

our Python/Django backend, web frontend, Flutter mobile app in beta, or Electron desktop app.