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Keybase vs Threema: catalog facts
Keybase	Threema
Free Free to install and use.	Paid A one-time purchase is required. Business plans are separate.
Windows, macOS, Linux, Android, iOS	Windows, macOS, Linux, Android, iOS, Web
End-to-end encrypted chat and file storage in one app Teams can be created with anyone, including families and clubs	No phone number or email required; the ID is random Apps are open source and the company is based in Switzerland
Linking public identities from other sites may not suit people who want anonymity Little recent public detail about new features or development pace	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
Not stated if an account is 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 24, 2026	Official website Full listing and sources Checked September 22, 2026

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