We have published an iOS app that is a utility for a relatively small demographic. It's been on the App Store since January, and we have a bit over 1,000 users.

We have published an iOS app that is a utility for a relatively small demographic. It's been on the App Store since January, and we have a bit over 1,000 users. I don't really expect it to get more than a couple of thousand. I did test it with 12,000 users (fake ones), so it should handle small scales, but it will definitely have to be rewritten, for much larger scales. It would not be as usable, in that case. At this scale, it works very well, indeed. That's fine. It works great, and we vet every signup, so we're not interested at all in scaling.