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FlowCryptGPG Suite
Freemium

Free extension for individuals, with paid business plans listed on the pricing page.

 Freemium

Downloads are free; the GPG Mail extension needs a paid yearly support plan after a 30-day…

Browser extension macOS
  • Works inside the normal Gmail interface
  • Encrypts both messages and attachments
  • Encrypt, sign and verify files and messages on a Mac
  • GPG Keychain app for managing OpenPGP keys
  • Built around Gmail rather than other mail providers
  • Business features require a paid plan
  • macOS only
  • GPG Mail requires a paid subscription
Browser extension Downloadable app
Closed source Closed source
License not stated License not stated
Not stated if an account is needed Not stated if an account is needed
Needs internet Not stated if it works offline

Checked September 24, 2026

Checked September 23, 2026

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