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Threema Work vs Signal: catalog facts
Threema Work	Signal
Paid Paid business licences, with a 30-day free trial.	Free Free; developed by a nonprofit funded by grants and donations
macOS	Android, iOS, Windows, macOS, Linux
End-to-end encrypted messaging for business use Focus on data protection and compliance	End-to-end encryption on every message and call using the open source Signal Protocol No ads, affiliate marketers or tracking
Paid licences aimed at organisations, not individuals Separate from the consumer Threema app	Requires a phone number that can receive an SMS or phone call to register Desktop app requires Signal to be installed on a phone first
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: AGPL-3.0
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 20, 2026

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