Chatto vs Mattermost
A side-by-side comparison of two open-source tools to help you choose the right one.
| Feature | CH | |
|---|---|---|
| Summary | Self-hostable team & community chat. | Secure team messaging for technical teams. |
| GitHub stars | 896 | 33K |
| License | AGPL 3.0 | Source Available |
| Language | Go | Go |
| Pricing | Free & Open Source | Free & Open Source |
| Self-hostable | ||
| Replaces | Slack, Microsoft Teams, Discord | Slack, Microsoft Teams |
| Rating | 4.6 / 5 | 4.5 / 5 |
Chatto features
- Real-time messaging with channels for teams and communities
- Built-in voice and video calls (powered by LiveKit)
- Screen sharing during calls
- Privacy-first and GDPR-compliant — data stays on your own servers
- Self-host via standalone binary, Docker Compose, or Kubernetes
Mattermost features
- Channels, threads, and direct messages
- Slash commands and integrations
- Playbooks for incident response
- SSO, LDAP, and compliance exports
- Self-hosted with full data control