Raven vs Zulip

Comparing two open source alternatives to Discord and Slack . Use the comparison below to decide which one fits your needs.

Raven

AGPL-3.0

Simple, open source team messaging platform

Apache-2.0

Open-source team chat with a unique topic-based threading model that makes it easy to follow multiple conversations.

	Raven	Zulip
License	AGPL-3.0	Apache-2.0
Self-hostable	No	Yes
GitHub Stars	671	24,935
Forks	298	9,728
Open Issues	162	2,040
Last Commit	Mar 27, 2026	Mar 27, 2026
First Released	Feb 10, 2023	Sep 25, 2015
Categories	Team Chat & Messaging Tools	Team Chat & Messaging Tools
Tags	#chat #messaging	#chat #messaging #collaboration

The communications platform that puts data protection first.

Mattermost is an open source platform for secure collaboration across the entire software development lifecycle..

A platform for community discussion. Free, open, simple.