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

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