Open-source PGP tools

6 PGP tools whose code is public under an OSI-approved license, rated for privacy with evidence. Picks first, then by score.

1. Mailvelope Grade A

   Browser extension that adds OpenPGP encryption to webmail services such as Gmail, Outlook.com and many others. Business editions integrate with Google Workspace and Nextcloud.

   AGPL-3.0. Source code

2. OpenKeychain Grade A

   OpenPGP app for Android that manages keys and encrypts, decrypts and signs messages and files, on its own or through other apps such as K-9 Mail. In maintenance mode: security fixes only, no new features.

   GPL-3.0. Source code

3. GPG4Win Grade B

   GnuPG distribution for Windows that bundles the Kleopatra certificate manager and the GpgOL plugin for Outlook for encrypting and signing files and email.

   GPL-2.0 and LGPL-2.1. Source code

4. Kleopatra Grade B

   KDE certificate manager and graphical front end for GnuPG. Manages OpenPGP and X.509 certificates, encrypts, decrypts, signs and verifies files, and retrieves certificates from LDAP servers.

   GPL-2.0 or later. Source code

5. SeaHorse Grade B

   GNOME app, shown as Passwords and Keys, for managing PGP and SSH keys and the passwords stored in GNOME Keyring.

   GPL-2.0 and LGPL-2.1. Source code

6. GPG Suite Grade C

   GnuPG distribution for macOS with key management, Finder and system service integration, and GPG Mail, an OpenPGP plugin for Apple Mail that requires a paid support plan.

   GPL-3.0. Source code

Compare all 8 PGP tools, open source or not.