Here's mine. It's not big or important (at all!) but I think it is a perfectly valid app that might be useful to some people. It's entirely vibe-coded including code, art and sounds. Only the idea was mine.

https://apps.apple.com/us/app/kaien/id6759458971

Can you give me any new (i.e. released in 2026) app that does something useful? There's just not many good app ideas left after all..