Mattermost
Signal
| Feature | Mattermost | Signal |
|---|---|---|
| Pricing | Free / from $10/mo | Free only |
| Free Plan | ✓ Yes | ✓ Yes |
| Rating | 4.2 / 5 | 4.6 / 5 |
| Best For | devops-teams, security-conscious-orgs, government, enterprise | privacy-advocates, journalists, activists, security-conscious-users |
| Founded | 2015 | 2014 |
| Messaging | ✓ | ✗ |
| Channels | ✓ | ✗ |
| Playbooks | ✓ | ✗ |
| Integrations | ✓ | ✗ |
| Self Hosting | ✓ | ✗ |
| Compliance | ✓ | ✗ |
| End To End Encryption | ✗ | ✓ |
| Group Chats | ✗ | ✓ |
| Voice Calls | ✗ | ✓ |
| Video Calls | ✗ | ✓ |
| Disappearing Messages | ✗ | ✓ |
| Screen Security | ✗ | ✓ |
✓ Mattermost Pros
- Self-hostable
- Open source
- DevOps integrations
- Secure
✗ Mattermost Cons
- Smaller ecosystem
- Fewer integrations than Slack
- Self-hosting complexity
✓ Signal Pros
- Industry-leading encryption
- Completely free and open-source
- No ads or data collection
- Cross-platform support
✗ Signal Cons
- Smaller user base than WhatsApp
- Limited business features
- No channels or bots
The Verdict
Mattermost is built for devops teams and security conscious orgs, with a focus on messaging and channels. Signal targets privacy advocates and journalists and leads with end-to-end-encryption and group-chats.
Signal uses custom enterprise pricing, while Mattermost starts at $10/mo — a tangible advantage for teams with a fixed budget.
Both offer free plans, so you can test each with your real workflow before committing to a subscription.
Signal edges out on user ratings (4.6 vs 4.2). While both are well-regarded, that gap reflects real differences in user satisfaction worth considering.
Bottom line: Signal has a slight overall edge — but if self-hostable matters most to you, Mattermost may still be the right call.