Alarm didn't go off

Yesterday my alarm didn’t go off because the app forgot I had a subscription, and the error message said the alarm was dropped because of that. That’s a bit scary, because i need to trust my alarm! Would it be safer to just buy the PRO version? Is it identical?
I really love this app!!(as long as it works, of course)

Yes, standalone PRO app version is identical and it is one time (but higher price) payment.

I’m sorry for your experience but I gad to do it that way in case someone configured all PRO alarms in “3 months” version and immediately cancelled (and refunded) it.