Compare software

Microsoft Teams (free)Mattermost
Freemium

Free edition available; Teams Essentials costs $4 per user per month, paid yearly.

 Freemium

The desktop client is free and open source. The Mattermost server has a free self-hosted…

Windows, macOS, Android, iOS, Web Windows, macOS, Linux
  • Chat, file sharing and meetings in one app
  • Meetings of up to 100 participants on the free tier
  • The server is self-hosted, so message data never leaves your infrastructure
  • Server dropdown lets one client connect to several Mattermost instances
  • Requires a Microsoft account
  • Proprietary and tied to Microsoft services
  • Needs a Mattermost server, which is real infrastructure to run
  • Electron, so memory use is high for a chat client
Downloadable app, Web application Downloadable app
Closed source Open source
License not stated License: Apache-2.0
Account needed Account needed
Needs internet Needs internet

Checked September 23, 2026

Checked September 21, 2026

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