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stashcatMattermost
Paid

The site directs organisations to request a quote or consultation.

 Freemium

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

Web Windows, macOS, Linux
  • Chat, video calls, and broadcast lists
  • Groups, polls, and appointments
  • The server is self-hosted, so message data never leaves your infrastructure
  • Server dropdown lets one client connect to several Mattermost instances
  • Aimed at organisations and requires a sales inquiry
  • Needs a Mattermost server, which is real infrastructure to run
  • Electron, so memory use is high for a chat client
Web application, Self-hosted, Hosted service Downloadable app
Closed source Open source
License not stated License: Apache-2.0
Not stated if an account is needed Account needed
Not stated if it works offline Needs internet

Checked October 8, 2026

Checked September 21, 2026

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