What does HackerNews think of open-keychain?
OpenKeychain is an OpenPGP implementation for Android.
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OpenKeychain is an Android app for doing some basic GPG related work. It can verify signatures (hidden in the "encrypt/decrypt" menu)
Also it integrates i.e. with K-9 mail to sign and verify.
Syncthing has a mobile app and there's an app for pass called PasswordStore[0] using OpenKeychain[1] (pgp manager). I'm not a fan of putting my private key on my mobile, but if I were, this would be a nice setup.
[0]: https://github.com/zeapo/Android-Password-Store
[1]: https://github.com/open-keychain/open-keychain
Edit: yeah for ctmg support, probably have to hold out for something like PostMarketOS to save us.
There's an app for that. Android Password Store[1]. You can use a Yubikey Neo with NFC in combination with Open Keychain[2]. Both are available on F-Droid.