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Mattermost

Mattermost is an open-source, self-hostable team collaboration platform (chat, workflow automation, and DevSecOps integrations) aimed at organizations — regulated enterprises, government, and technical teams — that need to run collaboration infrastructure entirely within their own environment. Its open-source core powers over 800,000 workspaces with contributions from 4,000+ developers, positioning it as a security- and data-sovereignty-focused alternative to SaaS-only chat tools.
collaborationOpen SourceSelf-HostedTeam Chat🔗 mattermost.com
69
B - Good
Product Quality
66
Market Reputation
44
Community Sentiment
62
Customer Experience
58
Technical Credibility
61
Value for Money
70
Innovation & Vision
100
Buying Safety
64
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AI model visibility: 20
Claude
Top pick
20 of 20 prompts
Gemini
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ChatGPT
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20 of 20 prompts
Community signals: 20
App Store
Neutral
55
Capterra
Positive
70
Clutch
Neutral
55
DEV Community
Positive
70
G2
Positive
74
Gartner Peer Insights
Neutral
45
GitHub Discussions
Positive
78
Glassdoor
Neutral
60
Hacker News
Neutral
68
PeerSpot
Neutral
65
Play Store
Neutral
55
Product Hunt
Neutral
55
Quora
Neutral
58
Reddit
Neutral
65
Software Advice
Neutral
68
Spiceworks
Neutral
62
Stack Overflow
Neutral
60
TrustPilot
Neutral
50
TrustRadius
Neutral
65
YouTube
Neutral
60
Evidence checkpoints: S3
✓SOC2 Type II Certification
✕ISO 27001 Certification
✓GDPR / Data Processing Agreement Published
✕Third-Party Penetration Test or Bug Bounty Program
✓Public Status / Uptime Page
✕Published SLA Terms
✕Gartner / Forrester Analyst Position
✓Cloud or Software Marketplace Listing
✕Technology Partner Certification
✓Public API Documentation
✓Transparent Pricing Page
✓Public Changelog / Release Notes
✓Verified Named Client Case Studies
✓Public Help Centre / Knowledge Base
What buyers are saying
“Praised by self-hosting/homelab and regulated-industry communities for data control”
Reddit
“Praised by self-hosting/homelab and regulated-industry communities for data control”
Reddit
“Praised by self-hosting/homelab and regulated-industry communities for data control”
Reddit