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Threema vs Keet: catalog facts
Threema	Keet
Paid A one-time purchase is required. Business plans are separate.	Free Free to download and use.
Windows, macOS, Linux, Android, iOS, Web	Windows, macOS, Linux, Android, iOS
No phone number or email required; the ID is random Apps are open source and the company is based in Switzerland	No phone number or email needed to sign up Messages, calls and files go directly between peers with end-to-end encryption
A one-time purchase is required for each platform Smaller user base than the mainstream encrypted messengers	Losing the 24-word seed phrase can mean losing access to your identity Peer-to-peer design depends on participants' devices rather than a server
Downloadable app	Downloadable app
Open source	Closed source
License: AGPL-3.0	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 23, 2026

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