I just downloaded it, in order to get White Noise.. I'm surprised White Noise is not available on F-Droid
Discussion
Because fdroid is insecure in comparison to zapstore.
They rebuild the app and could introduce malware.
With zapstore we sign it ourselves and nobody can tamper with the build.
Security experts have pointed time and time again issues with their build infrastructure.
But to be fair, they use developer builds if they are reproduceable (most are not). They will reject publication if non-free software is used though.