Mattermost vs Slack: Complete Comparison (2026)
In comparing Mattermost and Slack in 2026, Slack is the stronger choice for teams needing organized async communication due to huge app ecosystem. Mattermost excels for enterprises needing data sovereignty and self-hosting with full data control. Mattermost offers Self-hosted deployment, Channels, DevOps integrations starting at $10/user/mo (cloud) with a free plan. Slack provides Channels, Direct messages, App integrations from $7.25/user/mo with a free tier. For teams prioritizing value, Slack delivers a hiltonsoftware Score of 85/100. Mattermost and Slack compete in the team communication segment of the SaaS market, where cloud-native solutions, API integrations, and workflow automation drive enterprise and SMB adoption. Other leading team communication tools include Microsoft Teams, Discord, Zoom Chat. Mattermost serves 800K+ users globally (founded 2015) while Slack reports 32M+ active users (founded 2013).
Mattermost vs Slack at a Glance
What are the main differences between Mattermost and Slack?
Mattermost and Slack differ across ease of use, features, value, support, integrations, scalability, and learning curve. Slack leads in 7 of 7 categories.
What are the pros and cons of Mattermost vs Slack?
Which is better, Mattermost or Slack?
After evaluating Mattermost and Slack across features, pricing, integrations, and user satisfaction, Slack earns a higher hiltonsoftware Score of 85/100 versus Mattermost at 74/100. Slack stands out for "huge app ecosystem" and "intuitive interface". Mattermost delivers competitive advantages in "full data control", making Mattermost a viable alternative.
Both Mattermost and Slack offer free plans. Mattermost paid plans start at $10/user/mo (cloud) while Slack begins at $7.25/user/mo. ROI depends on which features justify upgrading.
Bottom line: Choose Mattermost for enterprises needing data sovereignty and self-hosting. Choose Slack for teams needing organized async communication. Both Mattermost and Slack are established team communication platforms.
Enterprises needing data sovereignty and self-hosting.
Teams needing organized async communication.
Mattermost vs Slack: Frequently Asked Questions
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Reviewed by Alex Chen, SaaS & Productivity Analyst. Last updated: 2026-04-24. Pricing verified: March 2026.
Read our scoring methodology to understand how the hiltonsoftware Score is calculated.