Mattermost vs Slack
Is it time to switch? We break down the differences so you can stop bleeding money.
Choose Mattermost.
If you want to own your data, save money, and avoid vendor lock-in, Mattermost is open source and community-driven.
What Actually Matters
No fluff — just the differences that affect your decision
Mattermost is open source (Other). Slack isn't. You can fork it, audit it, host it yourself — no permission needed. That matters.
Mattermost lets you self-host with Docker — your data, your rules. Slack? Cloud only. If privacy matters, that's a dealbreaker.
Mattermost dominates with 39.3k GitHub stars vs 0. Bigger community = more plugins, more answers on Stack Overflow, faster bug fixes.
Mattermost is built in TypeScript — you can read the source, contribute, or fork it. Slack is closed-source, so you're trusting their engineering.
Try both — most offer free tiers. The right pick depends on your stack size, team, and tolerance for DevOps.
Mattermost
Mattermost is an open source platform for secure collaboration across the entire software development lifecycle..
Why Choose Mattermost
- ✓Enterprise-grade security with SOC2 and HIPAA compliance
- ✓Granular access control and audit logging
- ✓Slack-compatible webhook and bot ecosystem
Drawbacks
- ×Self-hosting maintenance
Slack
Team communication platform.
Why Choose Slack
- ✓Best-in-class team communication UX
- ✓Huge integration ecosystem (2,000+ apps)
- ✓Powerful search across conversations
Drawbacks
- ×Expensive at scale ($8.75+/user/mo)
- ×Can become a constant distraction
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