Powerful open source group chat.
Threaded group conversations
Talk about multiple topics at once without getting lost or overwhelmed.
One-on-one and group private conversations
Have private conversations with one or as many people as you need.
We're always receiving messages for you, even when you're logged out.
Join a stream and see its history, so even new team members are never out of the loop. More Info »
Search is both snappy and smart, helping you look for text, people, and threads of conversation, with advanced search operators for fine-grained control.
Team presence and buddy list
See who is online at a glance.
Inline image, video, and tweet previews
Send a link and we'll automatically generate an inline preview.
Drag-and-drop file uploads
Drag a file into the compose box and we'll upload and preview it for you. Sharing and discussing work with teammates has never been easier.
Want someone's attention in a conversation? @-notify them and they'll be right over.
Use @all or @everyone to get the attention of everyone in a stream.
Emails for important missed messages
If you're missing important conversations when you're away from Zulip, we'll send you an email summary so you're always in the loop.
Configurable for private and stream messages.
So you don't miss important messages even when your eyes are elsewhere.
Discuss code, even multi-line code, with ease, including syntax-highlighting.
Get bulleted lists, clickable links, and nicely-formatted e-mail pastes automatically.
Enjoy the benefits of threaded conversations while controlling your audience and privacy.
Keep a todo list or keep track of interesting conversations.
Get alerts and updates from your favorite services with off-the-shelf integrations for Trac, Nagios, Github, Jenkins, and more.