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

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