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Google ChatMattermost
Freemium

Free with a Google account; business features come with paid Google Workspace plans.

 Freemium

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

Web Windows, macOS, Linux
  • Integrated with Gmail, Drive and Docs
  • Spaces with threaded conversations
  • The server is self-hosted, so message data never leaves your infrastructure
  • Server dropdown lets one client connect to several Mattermost instances
  • Requires a Google account
  • Hosted by Google with no self-hosting option
  • Needs a Mattermost server, which is real infrastructure to run
  • Electron, so memory use is high for a chat client
Web application, Hosted service Downloadable app
Closed source Open source
License not stated License: Apache-2.0
Account needed Account needed
Not stated if it works offline Needs internet

Checked September 24, 2026

Checked September 21, 2026

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