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

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