It totally sucks that Apple prohibits third-party apps from offering useful functionality that requires deep integration with the system. So no, it is not exactly &quot;OK.&quot;<p>However, it has nothing to do with rejecting apps because of it, and offering their own version of the functionality. Apple has always reserved this domain for themselves from day one, and f.lux would have had the exact same problems even if Apple hadn&#x27;t been doing their own version of it.