30 bucks for a screenshot app...
3 bucks I can easily life with, and would instantly grab my wallet without thinking.
10 bucks or 20 bucks even if I would use this often.
But 30 is quite steep IMHO
For me, it is worth the price.
I have used TimeSnapper on Windows for at least 5 years.
The only thing feature I can see from the apps page is that you can play back the screenshots at whatever speed you want, which hardly warrants $30.