I'd like to find an alarm clock/timer app that works on multiple devices.
I'd like to just set a timer for 6 hours just before sleeping, after which my iPad, Android phone and laptop (Windows) should yell bloody murder. Bonus if it makes sure I'm awake using some form of torture.
What I've tried:
Timely, but the free version seems buggy and too easy to mute in my early morning haze.
Google Calendar, but it requires too many clicks/taps to configure. I'm looking to have to just enter a number and click/tap and it should behave like an alarm. Google Calendar does something like a notify/short beep by default.