Huly vs Mattermost: which one to choose in 2026?
Both are open source alternatives to Slack. We compare license, tech stack and features to help you decide which fits your team best.
| Huly | Mattermost | |
|---|---|---|
| Category | Productivity | Productivity |
| License | AGPL-3.0 | MIT |
| GitHub stars | 11k | 30k |
| Tech stack | Rust, React, MongoDB | Go, React, PostgreSQL |
| Replaces | Linear, Notion, Slack | Slack, Microsoft Teams |
Mattermost has more GitHub stars, which usually indicates a larger community (not necessarily that it's the best option for your use case).
Huly
Projects + chat + docs in one, an alternative to Linear/Notion/Slack.
Pros
- Replaces three different SaaS tools with a single deployment
Things to consider
- Young project, integration ecosystem still limited
Mattermost
Security-focused team chat and collaboration, an alt. to Slack.
Pros
- Widely used in regulated and government environments
Things to consider
- The Team edition has fewer features than Enterprise
Key features
Huly
- Linear-style issues and projects
- Team chat and channels
- Collaborative documents
Mattermost
- Playbooks for incident management
- Native CI/CD integrations
- Configurable compliance and retention