Mattermost vs Slack: Complete Comparison (2026)
Updated: March 7, 20268 min read
VS
Quick Comparison
Mattermost
Slack
Starting Price
$10/user/mo (cloud)
$7.25/user/mo
Free Plan
Yes
Yes
Users
800K+
32M+
Founded
2015
2013
Rating
4.3/5
4.5/5
Best For
Enterprises needing data sovereignty and self-host...
Teams needing organized async communication.
Feature-by-Feature Comparison
MattermostSlack
88Ease of Use92
90Features94
90Value for Money94
81Customer Support85
83Integrations87
84Mobile App88
AI Verdict
Slack leads with a SoftScout Score of 90 vs 86 for Mattermost. Slack is best suited for Teams needing organized async communication, while Mattermost excels for Enterprises needing data sovereignty and self-hosting. Both are strong options in the Team Communication space.
CHOOSE MATTERMOST IF:
Enterprises needing data sovereignty and self-hosting.
CHOOSE SLACK IF:
Teams needing organized async communication.
Frequently Asked Questions
Is Mattermost better than Slack?
Slack scores 90/100 on SoftScout compared to Mattermost's 86/100. However, the best choice depends on your specific needs. Mattermost is best for Enterprises needing data sovereignty and self-hosting. Slack is best for Teams needing organized async communication.
Does Mattermost have a free plan?
Yes, Mattermost offers a free plan. Paid plans start from $10/user/mo (cloud).
Does Slack have a free plan?
Yes, Slack offers a free plan. Paid plans start from $7.25/user/mo.
Can I migrate from Mattermost to Slack?
Migration between Mattermost and Slack depends on the specific features you use. Both tools are in the Team Communication category. Check each tool's import/export options for data portability before switching.