Alarm Clock Pro is a utility that might prove to be of good use to anyone who needs to easily count time, set alarms or schedule to-dos. The program is packed with various built-in tools which help you immediately complete the aforementioned tasks.
This tool is so simple to handle that even a beginner Mac user wouldn't look for a help guide. Everything is where it's supposed to be and every setting is easy-to-configure. Each of the built-in tools comes with its own screen and set of options.
I tested all of the integrated utilities and they all provided me with accurate data. The World clock tool quickly generated correct results (converts time from one timezone to another), the Alarms featured dozens of useful settings (for example, set a favorite audio file from my Mac as the sound alarm), etc.
The only bad aspect, which is quite important, is the fact that it might use large amounts of CPU resources, especially when counting down time. In my testing, the CPU usage was around 60% (my Mac: 4 GB 1600 MHz DDR3, macOS 10.12). Still, this could happen because of my Mac.
In my opinion, you should first test the trial version of the utility. If you don't encounter the aforementioned issue, then it's definitely worth buying Alarm Clock Pro for your Mac or not.