Jam vs Mattermost
| Tagline | Open-source audio/video room server with no account required | Open-source, self-hostable Slack alternative for secure team messaging and collaboration |
| Category | Team Chat & Collaboration | Team Chat & Collaboration |
| Replaces | Slack, Discord, Microsoft Teams | Slack, Microsoft Teams, Discord |
| GitHub stars | 1.6k | 38k |
| Language | JavaScript | Go |
| License | AGPL-3.0 | MIT |
| Self-host difficulty | 2/5 Easy | 3/5 Moderate |
| Deploy options | Docker Docker Compose | One-Click Docker Docker Compose Kubernetes Manual |
| Managed hosting | ||
| Last updated | 1 month ago | 5 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.
Jam
- No persistent channels, history, or message storage
- No authentication or access control by default
- Limited scalability beyond small groups without custom TURN/SFU configuration
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
Bottom line
Choose Jam if you want the lower-effort setup; 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