The issue of what apps & devices trigger when is surprisingly difficult to figure out. I ask about it whenever I interview product managers, so far nobody can explain how it currently works or how it is supposed to work.

It's not documented anywhere. I miss documentation.

And then you could write test cases, based on the documentation

All I want for my iPhone is an alarm app that has a widget which will show me when the next alarm will go off (and ideally give me the time remaining if it's within a day). I'm always double checking that I didn't edit my daily alarm or leave it disabled after a vacation or set tomorrow's alarm to 7pm instead of am...

The stock "Up Next" widget shows your next alarm time and date if one is set. Currently shows "Alarm tomorrow at 07:30" for me.

Oh awesome, that does it! And in fact it shows that I have a 6am alarm for tomorrow that I don't need :)

Even better, add calendar reminders to this list. I guess reminders are like modifier keys for Apple, 4 better than 2.

We need a standard, here. Perhaps the introduction of EpochKit and an accompanying SunDial app.

Missing from this:

     - calendar items (if you want to share with others...)
     - whether the vibrate mode button silences the alarm/alert/reminder/whatever (it sucks to forget about alarms when you go to the movies)