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Threema Work vs Mattermost: catalog facts
Threema Work	Mattermost
Paid Paid business licences, with a 30-day free trial.	Freemium The desktop client is free and open source. The Mattermost server has a free self-hosted…
macOS	Windows, macOS, Linux
End-to-end encrypted messaging for business use Focus on data protection and compliance	The server is self-hosted, so message data never leaves your infrastructure Server dropdown lets one client connect to several Mattermost instances
Paid licences aimed at organisations, not individuals Separate from the consumer Threema app	Needs a Mattermost server, which is real infrastructure to run Electron, so memory use is high for a chat client
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: Apache-2.0
Not stated if an account is needed	Account needed
Needs internet	Needs internet
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 21, 2026

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