Chitchatter vs Mattermost
| Tagline | Serverless peer-to-peer ephemeral chat with no accounts 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 |
| GitHub stars | 2.3k | 38k |
| Language | Nodejs | Go |
| License | GPL-2.0 | MIT |
| Self-host difficulty | 1/5 Effortless | 3/5 Moderate |
| Deploy options | One-Click Manual | One-Click Docker Docker Compose Kubernetes Manual |
| Managed hosting | ||
| Last updated | today | today |
| View repo | View repo |
Where each falls short
The honest trade-offs — what you give up with each, versus the proprietary tools they replace.
Chitchatter
- No message history; all chats are ephemeral and disappear on page close
- No file sharing, threads, reactions, or integrations
- WebRTC NAT traversal can fail on restrictive corporate networks
- No moderation, authentication, or access control features
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 Chitchatter if you want the lower-effort setup; choose Mattermost for the larger community and ecosystem. 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