I built Send Alarm, an iPhone app for one very specific problem: sometimes a message or call is not enough to wake someone up. The app lets you send an alarm to another person, but it only rings if they accept it. They can accept once, always accept from you, decline, or block. The actual alarm is scheduled on their iPhone with AlarmKit, so it rings through Silent and Focus. Use cases I had in mind: - waking a heavy sleeper - making sure a friend catches an early flight - study buddies...