When this app works, it is nice. I paid for the 1 yr subscription as it did the job for a time. In November on a work trip, it began to fail me regularly resulting many late wake ups. I have adjusted settings and followed tips online but it has been unreliable since November on Galaxy S20+ and Galaxy Watch 4. I recommend caution and use the test period to see if you have the same issues. Set a backup alarm to be safe.