I haven't used this app, but something that makes me smile is that the paid version is only 563KB (the paid version is 4.6MB, and I suppose it's pleasant that the ad SDKs are "only" 4 megs). After seeing every major app take up 100MB+ for years, I had just assumed that there was some kind of static packaging inherent to all iOS apps that jacked the deliverable size up so high. I don't know whether Ueda was deliberately trying to get it as small as possible, or if his design is so elegant that it just naturally led to such a tiny artifact. Either way, as long as the 3.5" floppy is still in its sunset period[0], I suppose it's nice that there's modern software that will still fit on it.