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Kleopatra vs Gpg4win: catalog facts
Kleopatra	Gpg4win
Free Free and open source.	Free Free software, funded by donations and public contracts.
Linux	Windows
Handles both OpenPGP and S/MIME certificates Key lookup through key servers, LDAP and WKD	Kleopatra gives GnuPG a real key manager instead of a command line Integrates with Outlook through GpgOL and with Explorer through GpgEX
Certificate concepts can be daunting for newcomers	Windows only OpenPGP key management is genuinely hard, and the concepts do not hide well behind a GUI
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL-2.0
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 20, 2026

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