Mattermost vs Zulip
Comparing two open source alternatives to Discord and Slack . Use the comparison below to decide which one fits your needs.
Mattermost
Mattermost is an open source platform for secure collaboration across the entire software development lifecycle..
Zulip
Apache-2.0Open-source team chat with a unique topic-based threading model that makes it easy to follow multiple conversations.
Side-by-side comparison
| Mattermost | Zulip | |
|---|---|---|
| License | — | Apache-2.0 |
| Self-hostable | No | Yes |
| GitHub Stars | 35,990 | 24,935 |
| Forks | 8,460 | 9,728 |
| Open Issues | 836 | 2,040 |
| Last Commit | Mar 28, 2026 | Mar 27, 2026 |
| First Released | Jun 15, 2015 | Sep 25, 2015 |
| Categories | ||
| Tags | — |
