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SlackMattermost
Freemium

Free plan available, with paid plans for more features.

 Freemium

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

Windows, macOS, Linux, Android, iOS, Web Windows, macOS, Linux
  • Channels keep team conversations organized
  • Large range of app integrations
  • The server is self-hosted, so message data never leaves your infrastructure
  • Server dropdown lets one client connect to several Mattermost instances
  • Closed source hosted service
  • Many features and AI tools sit behind paid plans
  • Needs a Mattermost server, which is real infrastructure to run
  • Electron, so memory use is high for a chat client
Downloadable app, Web application, Hosted service 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.