What a strange comment. Don’t buy if you don’t want it. Develop a free alternative if you are passionate about it.
But just complaining like this? Is it considered dirty to sell something now? At least it’s not a subscription.
In an ideal world, this app should be programmable in the same time it takes to read the website and buy it.
Not questioning the reasons why such app need to be paid seems even stranger to me.
It’s a niche thing and if it’s well implemented the price seems reasonable to me.
To be clear, not because the developer is bad (I did not try it outside of the website demo), but because of the state of software development imposing pointless complexity.
How hard do you believe it should be to play a sound on keystroke?