Keep in mind....it works....apparently. Not saying this is a "get what you pay for situation" but there is something to be said about a temp sensing program that can measure temps (SSD) vs a temp sensing program that cannot measure temps.
Also its a fan controller which goes hand in hand with temps.
I do agree it is expensive now. I originally bought it for ~10 dollars years ago. But that $18 could be easily justified depending on what you are trying to accomplish.
When I got it there were no other programs available that could adjust the fan speed to specific component temps in a way TG Pro could. For example when gaming I wanted the fan to:
1. SLOWLY ramp up over the course of time when GPU temps reached 85c (not just shoot to max)
2. Not exceed 80% max fan speed for that single component unless OS X needed to override it
3. Not need to turn it off when done gaming
That way the fan would quietly increase before the OS would ramp it up and keep the GPU cooler than stock while minimizing noise levels all without overriding the OS fan control so I didn't need to turn it on/off before and after gaming. BTW the problem I was having is the OS would increase the fan to max on and off, on and off which got tiring. The above method had it running longer but at lower speeds (quieter) which was much easier to tolerate.
While that list seemed ridiculous request TG Pro easily accomplished it.
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I'm not sure but maybe other programs offer that now? At the time when I got TG Pro they didn't. Or if they got close it was sketchy because they would override the OS fan control and cause the CPU to overheat when I was transcoding videos if I forgot to turn it off.
Regardless I do feel its a premium product and therefore should command a premium price although $18 dollars does seem excessive.
But they took something that is relatively trivial (measuring temps) and cranked it to 11. From a plethora of menu bar customizations to the app being able to email you a notification on temp/fan triggers plus logging for diagnostic reasons.
Plus it sticks to specifically temps and fan control without bloating the software with "other" features that are unrelated to that. I know other features can just be ignored but I feel like a program is gimmicky when they start adding things unrelated to its original purpose. Like an iOS calculator app that has a compass function or something.
Not only are the dev(s) active members here that take customer feedback seriously they respond to support emails very quickly and are always helpful. I had a minor issue with an update, and they responded and fixed my issue within an hour on a Saturday.
Yes, I know I sound like a paid shill. However this is a program that is often overlooked and I've been extremely happy with it so I feel somewhat obligated to at least let people know it exist.