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MailvelopeGPG Suite
Free

Free and open source for personal use. Business products are paid.

 Freemium

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

Browser extension macOS
  • Works inside existing webmail rather than requiring a desktop mail client
  • Keys stay in the browser under your control
  • Encrypt, sign and verify files and messages on a Mac
  • GPG Keychain app for managing OpenPGP keys
  • Only supports a defined list of webmail sites
  • Browser-based key storage is weaker than a dedicated client or smartcard
  • macOS only
  • GPG Mail requires a paid subscription
Browser extension Downloadable app
Open source Closed source
License: AGPL-3.0 License not stated
Not stated if an account is needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked September 22, 2026

Checked September 23, 2026

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