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OpenKeychain vs GnuPG: catalog facts
OpenKeychain	GnuPG
Free Free and open source, supported by donations.	Free Free and open source under the GPL.
Android	Windows, macOS, Linux, Command line
Compatible with OpenPGP software on other platforms Provides encryption to other Android apps such as K-9 Mail	The reference free OpenPGP implementation, present everywhere Smartcard and hardware token support through its agent
Android only Using OpenPGP keys well requires some understanding of how key exchange works	Key management and the command line are famously unforgiving Defaults and trust models confuse newcomers into unsafe practice
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0
No account needed	Not stated if an account is needed
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.