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GnuPG vs OpenKeychain: catalog facts
GnuPG	OpenKeychain
Free Free and open source under the GPL.	Free Free and open source, supported by donations.
Windows, macOS, Linux, Command line	Android
The reference free OpenPGP implementation, present everywhere Smartcard and hardware token support through its agent	Compatible with OpenPGP software on other platforms Provides encryption to other Android apps such as K-9 Mail
Key management and the command line are famously unforgiving Defaults and trust models confuse newcomers into unsafe practice	Android only Using OpenPGP keys well requires some understanding of how key exchange works
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 23, 2026

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