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Mattermost
FREE PLANPOPULAROpen-source, self-hosted team messaging for security-conscious organizations.
★★★★★4.3
800K+ usersFounded 2015Score Breakdown
Ease of Use
88
Features
90
Value for Money
90
Customer Support
78
Integrations
83
Pros & Cons
✓Full data control
✓Strong security features
✗Requires IT to self-host
✗UI is less polished than Slack
Key Features
✓Self-hosted deployment
✓Channels
✓DevOps integrations
✓Compliance tools
Best For
Enterprises needing data sovereignty and self-hosting.
Pricing
Free
For individuals
Pro
For small teams
Business
For companies
Enterprise
Advanced controls