What are the key differences between Slack and Mattermost?

Compare Slack and Mattermost side by side on Lunoo to see detailed feature differences, AI scores, and expert analysis.

How are Slack and Mattermost scored?

Slack has an AI score of 8.99/10 and Mattermost has an AI score of 7.31/10. Scores are based on category fit, feature coverage, pricing signals, public reception, and recency.

Slack vs Mattermost 2026 - Compared

Slack

Mattermost

WINNER Slack

Slack edges ahead with a score of 9.0/10 compared to 7.3/10 for Mattermost. While both are highly rated in their respect...

emoji_events WINNER

Slack

8.99 Great

Communication Get Slack open_in_new

Mattermost

7.31 Good

Communication Get Mattermost open_in_new

Slack From $6/mo per user Free plan available

payments

Mattermost From $5/user/month for the paid plan Free plan available

psychology AI Verdict

Slack edges ahead with a score of 9.0/10 compared to 7.3/10 for Mattermost. While both are highly rated in their respective fields, Slack demonstrates a slight advantage in our AI ranking criteria. A detailed AI-powered analysis is being prepared for this comparison.

emoji_events Winner: Slack

verified Confidence: Low

Ready to decide? Get Slack arrow_forward

description Overview

Slack

Slack is a cloud-based team communication platform renowned for its exceptionally intuitive interface and seamless onboarding experience. Users can create channels, send direct messages, share files, and integrate with hundreds of third-party tools within minutes of signing up. The clean, organized workspace makes navigating conversations effortless, even for non-technical team members. Its search...

Mattermost

Mattermost is an open-source, self-hosted Slack alternative focused on security and data control. It offers similar features to Slack, including channels, direct messaging, and file sharing, but with the added benefit of complete control over your data. This makes it ideal for organizations with strict compliance requirements or concerns about data privacy. Mattermost's self-hosting capabilities a...