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Is there a foss biometrics management app?
(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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That's usually part of the OS, not an app. Probably some custom ROMs support it.
I never found a custom ROM that didn't support that (unless it's early alpha or those "android 13 for a device that shipped with android 5")