Mattermost vs Slack

A side-by-side comparison built from catalogue data. Both offer 4 of the same listed features, including API access, File sharing, Threads.

Comparison of Mattermost vs Slack

App	Mattermost Open-source, self-hostable team messaging and collaboration platform.	Slack Team messaging organised into channels with integrations and huddles.
Developer	Mattermost Inc.	Salesforce
Pricing	Free, Freemium, Subscription	Freemium, Subscription
License	GNU AGPL v3	Proprietary
Open source	Open source: Yes	Open source: No
Self-hostable	Self-hostable: Yes	Self-hostable: No
Works offline	Works offline: No	Works offline: No
Privacy-focused	Privacy-focused: Yes	No

Feature rows list only features recorded in the catalogue. A missing check means the feature is not recorded for that app, not necessarily that it is unavailable.