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Kleopatra vs OpenKeychain: catalog facts
Kleopatra	OpenKeychain
Free Free and open source.	Free Free and open source, supported by donations.
Linux	Android
Handles both OpenPGP and S/MIME certificates Key lookup through key servers, LDAP and WKD	Compatible with OpenPGP software on other platforms Provides encryption to other Android apps such as K-9 Mail
Certificate concepts can be daunting for newcomers	Android only Using OpenPGP keys well requires some understanding of how key exchange works
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL-3.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 23, 2026

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