I call this doing nothing with... nothing. It aligns closer to the spirit of emptiness.
Re: the app. My personal experience has been after while if you need an app to do nothing …
I get the impression that you haven't read the article/UI text in the app, so can't comment on the rest of your message I'm afraid.
But, to you some time: I don't charge for the app, I hate ads, I just want people to sit down and do nothing/stop doomscrolling. No need to meditate and no ideology involved.
That's my reaction to all these mindfulness and mental health apps/services. The same tech bros that have created and profited off this crisis in the first place are now trying to sell a solution.
Good-quality incense burns pretty consistently -- when I sit, I sit the time it takes one stick to burn down. There's even incense-burners that will ring a little bell when the stick burns down, but I just stay aware of it.
I've long given up on meditation timers. I go to a room without any digital technology except for a Casio F91W. I have gotten good at gauging how long I've been concentrating for and if I have aversion to continued sitting I just peek at the watch to know how long it's been.
This is a solved problem that costs $0 and I don't have to worry about receiving personalised ads because I'm into 'mindfulness'.