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Mattermost vs Microsoft Teams (free): catalog facts
Mattermost	Microsoft Teams (free)
Freemium The desktop client is free and open source. The Mattermost server has a free self-hosted…	Freemium Free edition available; Teams Essentials costs $4 per user per month, paid yearly.
Windows, macOS, Linux	Windows, macOS, Android, iOS, Web
The server is self-hosted, so message data never leaves your infrastructure Server dropdown lets one client connect to several Mattermost instances	Chat, file sharing and meetings in one app Meetings of up to 100 participants on the free tier
Needs a Mattermost server, which is real infrastructure to run Electron, so memory use is high for a chat client	Requires a Microsoft account Proprietary and tied to Microsoft services
Downloadable app	Downloadable app, Web application
Open source	Closed source
License: Apache-2.0	License not stated
Account needed	Account needed
Needs internet	Needs internet
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.