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FlowCryptMailfence
Freemium

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

 Freemium

A free account is available, with paid plans for more features.

Browser extension Android, iOS, Web
  • Works inside the normal Gmail interface
  • Encrypts both messages and attachments
  • OpenPGP encryption and signing in the browser
  • Standard IMAP, POP and SMTP access
  • Built around Gmail rather than other mail providers
  • Business features require a paid plan
  • Hosted service only
  • Advanced features sit on paid plans
Browser extension Downloadable app, Web application, Hosted service
Closed source Closed source
License not stated License not stated
Not stated if an account is needed Account 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.