Nope

It’s great as long as waking up on time isn’t a necessity. I don’t know what the problem is, I make sure my computer isn’t asleep, I make sure my sound is on full blast,I make sure it’s plugged in yet inevitably, every time I wake up, It’s usually an hour or more later than I wanted and, the app has muted itself, oh the alarm is going, It’s just never audible……… Incredibly frustrating when you try getting just a couple hours of sleep with a fast approaching deadline. Truly disappointing. The problem persists even after I download the extension to wake my computer from sleep to sound the alarm. It just does not work as advertized for macs.

RealWorldMan1996 about Wake Up Time - Alarm Clock