Mattermost vs Zulip
| Tagline | Open-source, self-hostable Slack alternative for secure team messaging and collaboration | Open-source team chat with a unique topic-based threading model |
| Category | Team Chat & Collaboration | Team Chat & Collaboration |
| Replaces | Slack, Microsoft Teams, Discord | Slack, Microsoft Teams |
| GitHub stars | 39k | 26k |
| Language | Go | Python |
| License | MIT | Apache-2.0 |
| Self-host difficulty | 3/5 Moderate | 3/5 Moderate |
| Deploy options | One-Click Docker Docker Compose Kubernetes Manual | Docker Compose Manual |
| Managed hosting | ||
| Last updated | 2 days ago | 3 days ago |
| View repo | View repo |
Where each falls short
The honest trade-offs — what you give up with each, versus the proprietary tools they replace.
Mattermost
- Many advanced features (LDAP/AD, SAML/SSO, compliance exports, high availability) are gated behind paid Enterprise tiers
- Search and message UX feel less polished than Slack
- Voice/video calling is more limited than Teams' full meetings stack
- Smaller third-party app/integration marketplace than Slack
Zulip
- Native voice/video calling is limited and usually relies on third-party integrations (Jitsi, Zoom)
- The topic-threading model has a learning curve and can feel unfamiliar to Slack users
- Production installs effectively want a dedicated server; multi-host scaling is involved
- Smaller app/integration ecosystem than Slack
Bottom line
Both are a similar lift to self-host; choose Mattermost for the larger community and ecosystem. Mattermost has seen more recent development. Open each guide below for deploy steps and the full feature gap.
Mattermost
Open-source, self-hostable Slack alternative for secure team messaging and collaboration