Forum vs Mattermost: Which is Better in 2026?
Choosing between Forum and Mattermost comes down to understanding what each tool does best. This comparison breaks down the key differences so you can make an informed decision based on your specific needs, not marketing claims.
Bottom line: Mattermost wins this matchup. Microsoft Teams is our overall Communication pick. Microsoft Teams is our free Communication pick. Pick Forum if you need community platforms.
Short on time? Here's the quick answer
Based on published vendor pricing and features and on public review data, here's who should pick what:
Forum
Connect, collaborate, and grow your community with a powerful forum platform.
Best for you if:
- • You want a fully free tool (Mattermost requires payment)
Mattermost
Open-source team collaboration platform
Best for you if:
- • You want open source Slack alternative
| At a Glance | Forum | Mattermost |
|---|---|---|
Starts at | Free 100% free | Free Free plan |
Category | Community Platforms Communication | Communication Team Chat |
Rating | n/a | 4.3/5 G2 4.3 · Capterra 4.4 · SourceForge 4.3 604 reviews |
Free plan | Yes | Yes |
Choose Forum or Mattermost?
Choose Forum if
- You want a fully free tool (Mattermost requires payment)
- You want structured discussions preserve knowledge better than chat platforms
- You want persistent content remains searchable and accessible over time
- You work in community platforms, not communication
Choose Mattermost if
- You want open source Slack alternative
- You want self-hostable
- You work in communication, not community platforms
In-Depth Analysis
Forum
Connect, collaborate, and grow your community with a powerful forum platform.
Forum's pricing is exceptionally generous, as it offers a fully-featured community platform completely free.
Strengths
- Pro: Structured discussions preserve knowledge better than chat platforms
- Pro: Persistent content remains searchable and accessible over time
- Pro: Builds engaged communities around shared interests or products
- Pro: Customizable to match organizational branding and needs
Weaknesses
- Con: Requires active moderation to maintain content quality
- Con: Can be slower-paced than real-time chat tools
- Con: User adoption requires ongoing community management effort
Key features
Mattermost
Open-source team collaboration platform
Mattermost's pricing is fair, offering a generous Free tier for small teams.
Strengths
- Pro: Open source Slack alternative
- Pro: Self-hostable
- Pro: Good for compliance
- Pro: No per-user cloud cost
- Pro: Customizable
Weaknesses
- Con: Less polished than Slack
- Con: Smaller integration library
- Con: Self-hosting required for best value
- Con: Learning curve
- Con: Community smaller
Key features
Pricing: Forum vs Mattermost
| Plan | Forum | Mattermost |
|---|---|---|
| Tier 1 | N/A | Free Free |
| Tier 2 | N/A | $10 Professional |
| Tier 3 | N/A | Custom Enterprise |
Pricing verified from each vendor's public pricing page. Compare in detail on Forum pricing and Mattermost pricing.
Key Takeaways
Mattermost
- Free tier available
- Our pick for this comparison
Forum
- Completely free
- Better fit for community platforms
The Bottom Line
Mattermost wins this matchup. Microsoft Teams is our overall Communication pick. Microsoft Teams is our free Communication pick. That said, Forum is free, hard to beat on price.
Frequently Asked Questions
Is Forum or Mattermost better in 2026?
Mattermost wins this matchup. Microsoft Teams is our overall Communication pick. Microsoft Teams is our free Communication pick. Pick Forum for community platforms workflows (main strength: structured discussions preserve knowledge better than chat platforms). Pick Mattermost for communication workflows (main strength: open source Slack alternative).
What are Forum and Mattermost used for?
Forum: Connect, collaborate, and grow your community with a powerful forum platform. Mattermost: Open-source team collaboration platform.
What does Forum cost vs Mattermost?
Forum is free. Mattermost's paid plans start at Free (Professional).
What's the main difference between Forum and Mattermost?
Forum's main strength: structured discussions preserve knowledge better than chat platforms. Mattermost's main strength: open source Slack alternative.