I see that they claim all of their apps and libraries are open source[0]. But they only link to the OpenPGP libraries they're using. Is this actually open source? Following the "Open Source" footer link[1], here they only link to the ProtonMail Github account with nothing mentioning ProtonDrive.

And if it is actually open source, I'd love to see a comparison to CryptPad[2]

> which is why we’ve made all our apps and encryption libraries open source

[0] https://proton.me/drive/security

[1] https://proton.me/community/open-source

[2] https://cryptpad.org/