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Proton Pass app just landed in F-Droid
(lemmy.ml)
F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.
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I get Proton Mail via Obtainium directly from GitHub. They recently also added Proton Drive but they didn't add a release so it doesn't work there.