The UI is slow as snails and a little clunky. But, it does all work. You have an impressive amount of ways to build and customize your app. It's better than I expected it to be, tbh. It's better than quite a few other app builders I tried: GoodBarber (decent), AppPresser (crap), Natively (crap).

Biggest gripe I see besides the slow, clunky UI is that the custom font options are all bad, and I don't see any way to upload my own typefaces.

But as a lifetime deal for a basic app, it's better than a lot of other options. If you have more money to spend I'd look at median or mobiloud