(Credit to the original authors here: Cary & Michael Huang. I don't know if they are connected to the project in the app: edit: yes they are (as influence), and credited, see reply below)
At some point in our pasts, we had both become enamored with two fun room icons, Cary and Michael Huang, known on the internet as the Huang Twins. The twins do a lot of cool things, but it was their Scale of the Universe toy that we loved most.
Inspired by their work, we decided to go for it. We wanted to make the best size explorer we could imagine. We called it Universe in a Nutshell.
Meta: I had to read this title three times to guess what it might have intended to say. I suppose it would help if I had heard of this website before. I think "Wait but Why" could benefit from this capitalization, which is also used in the article, or just "Wait But Why."
I felt a bit manipulated to be directed to their app at the end of a video to discover it costs money. The way it was worded didn't set up that expectation.
Maybe I'm wrong, did anyone else have that experience?
It's very possible I was being daft, but for some reason, I assumed this cost money until I got to that sentence. I guess it's because I still naively assume that any up-front price tag should imply a lack of ads, ergo such a caveat is only necessary if the app is already free.
IMO, they should have listed the price on the page. The other merchandise on their site has prices listed, and an app should be no different.
I can understand that concern. But it leaves price changes in the future open (including perhaps making it free at some point) without having to delete and upload an edited video.