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WireMattermost
Freemium

A limited free personal tier is available. Business plans are paid.

 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
  • Encrypted group calls and guest rooms aimed at organisations
  • Clients are open source and the server can be self-hosted
  • The server is self-hosted, so message data never leaves your infrastructure
  • Server dropdown lets one client connect to several Mattermost instances
  • The free personal tier is limited and the focus is on paid business plans
  • Requires an account tied to an email address or phone number
  • Needs a Mattermost server, which is real infrastructure to run
  • Electron, so memory use is high for a chat client
Downloadable app, Hosted service Downloadable app
Open source Open source
License: GPL-3.0 License: Apache-2.0
Account needed Account needed
Not stated if it works offline Needs internet

Checked September 22, 2026

Checked September 21, 2026

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