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Gpg4win vs Free-GPGMail: catalog facts
Gpg4win	Free-GPGMail
Free Free software, funded by donations and public contracts.	Free Free and open source under the GPL-3.0 license.
Windows	macOS
Kleopatra gives GnuPG a real key manager instead of a command line Integrates with Outlook through GpgOL and with Explorer through GpgEX	OpenPGP encryption and signing inside Apple Mail No support plan purchase needed
Windows only OpenPGP key management is genuinely hard, and the concepts do not hide well behind a GUI	macOS and Apple Mail only Unofficial build that may lag behind GPGTools releases
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License: GPL-3.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 20, 2026	Official website Full listing and sources Checked October 2, 2026

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