OpenKeychain is an OpenPGP implementation for Android. It manages your keys and those of your contacts, and integrates with K-9 Mail and FairEmail for end-to-end encrypted email on Android devices.
OpenKeychain
Official website openkeychain.org
Our take
OpenKeychain passed an independent security audit by Cure53 with no critical findings, which is a meaningful bar for an app handling key material on a mobile device. Development has gone quiet and the project is in maintenance mode rather than active growth, but the app remains functional and security patches are still applied when reported. It covers a genuine gap: OpenPGP on Android with a clean integration into the leading open-source mail clients. Choose it if you need PGP on Android; be aware you are on a tool that is no longer being pushed forward.
GitHub at a glance
open-keychain/open-keychain
Stars
2,571
+ 0 this week
Last commit
2.1y ago
slowing
License
GPL-3.0
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Listed in
OpenKeychain alternatives
VERNAM A free, fully client-side file encryptor that runs in your browser. Drop in any file, set or generate a passphrase, and it seals the result into its own .vrn format. Nothing is ever uploaded, and it works offline.
VeraCrypt It can create a virtual encrypted disk that works just like a regular disk but within a file. It can also encrypt a partition or the entire storage device with pre-boot…
Cryptomator Cryptomator encrypts your data quickly and easily. Afterwards you upload them protected to a cloud service.
7-Zip File archiver with a high compression ratio and built-in encryption functionality.
GnuPG GnuPG (GNU Privacy Guard) is the free, GPL-licensed implementation of the OpenPGP standard. A command-line tool for Linux, macOS, and Windows, it encrypts and signs files and email, and manages public-key directories.
Gpg4win Gpg4win is the official Windows installer for GnuPG, bundling the Kleopatra certificate manager and GpgOL for Outlook integration. It provides OpenPGP and S/MIME encryption for files and email on Windows.
OpenKeychain license, in plain English
GPL-3.0 Strong copyleft
Free to use and modify, but anything you distribute that is built on it must also be open under the same license.
Permits
- Commercial use
- Modification
- Distribution
- Patent use
- Private use
Requires
- Disclose source
- Same license
- State changes
- License and copyright notice
Does not provide
- Liability cover
- Warranty
Why it matters: Strong copyleft keeps every distributed version open. A vendor cannot fold this into a closed product and ship it without releasing their changes.
Plain-language summary of the project's license, not legal advice. Read the full text for the exact terms.