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OpenKeychainMailvelope
Free

Free and open source, supported by donations.

 Free

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

Android Browser extension
  • Compatible with OpenPGP software on other platforms
  • Provides encryption to other Android apps such as K-9 Mail
  • Works inside existing webmail rather than requiring a desktop mail client
  • Keys stay in the browser under your control
  • Android only
  • Using OpenPGP keys well requires some understanding of how key exchange works
  • Only supports a defined list of webmail sites
  • Browser-based key storage is weaker than a dedicated client or smartcard
Downloadable app Browser extension
Open source Open source
License: GPL-3.0 License: AGPL-3.0
No account needed Not stated if an account is needed
Works offline Not stated if it works offline

Checked September 23, 2026

Checked September 22, 2026

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