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FlowCrypt vs Gpg4win: catalog facts
FlowCrypt	Gpg4win
Freemium Free extension for individuals, with paid business plans listed on the pricing page.	Free Free software, funded by donations and public contracts.
Browser extension	Windows
Works inside the normal Gmail interface Encrypts both messages and attachments	Kleopatra gives GnuPG a real key manager instead of a command line Integrates with Outlook through GpgOL and with Explorer through GpgEX
Built around Gmail rather than other mail providers Business features require a paid plan	Windows only OpenPGP key management is genuinely hard, and the concepts do not hide well behind a GUI
Browser extension	Downloadable app
Closed source	Open source
License not stated	License: GPL-2.0
Not stated if an account is needed	No account needed
Needs internet	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.