Somewhere in the advice you have already read about fixing an AI-built app, you have probably seen the words cleanup, refactoring, and rebuild used as if they describe three clearly different services. They do not, not really, and pretending otherwise makes the actual decision harder than it needs to be.
Cleanup and refactoring are already the same thing
Wikipedia's own entry on the subject, titled simply Code cleanup, says plainly that the term is often used interchangeably with refactoring, tidying up and reorganizing the existing code without changing what the app actually does. That is not a shortcut definition written for beginners. It is the accepted, standard meaning. So if someone offers to clean up your app and someone else offers to refactor it, in practical terms you are being offered close to the same thing twice, not choosing between two different levels of service.
The genuinely different option, the one worth spending your attention on, is a rebuild: starting over and writing the app again rather than repairing what is already there. That is the real decision in front of you. Everything else is really a question of how much repair the existing app needs, not a separate category of its own.
Signs that repair is the honest answer
Most of the time, repair is enough. If your app mostly works and the problems you are running into are a handful of specific, describable bugs, a broken form here, a display issue there, that is a strong sign the underlying app is sound and just needs attention in a few places. If a developer looking at it can point to roughly what is wrong and roughly why, that is another good sign. Problems that are traceable, even if there are several of them, are usually fixable without starting from scratch.
Cost is a reasonable, if rough, second signal. If a developer's estimate to fix what is wrong is a modest fraction of what it originally cost to build the app, repair is very likely the more sensible route. Throwing away something that mostly works because a few pieces of it are broken is rarely a good trade, even when starting fresh feels tempting.
Signs that a rebuild is the more honest answer
The clearer signal that repair will not be enough is when nobody, including whoever or whatever built the app originally, can explain why it behaves the way it does. If a developer opens it up and cannot form a confident theory about what is actually causing the problem, even after real effort, that is not a small thing. It usually means the app was assembled in a way that never had a coherent structure to begin with, often the result of many separate AI prompts stitched together over time without anyone checking that they fit.
A second, more specific signal is when a basic security fix keeps breaking something else. If closing one hole in how user data is protected keeps causing an unrelated part of the app to stop working, that is a sign the different pieces of the app were never really built to work safely together in the first place, and that patch after patch is only going to keep surfacing new versions of the same underlying problem.
Admitting a rebuild is needed rarely feels good. It can feel like conceding that money and time were wasted, and there is no honest way to fully soften that. But the alternative, repeatedly paying to patch an app that keeps finding new ways to break, tends to cost more in the end than starting over would have, and it costs you that money slowly instead of all at once, which somehow makes it feel less painful even though it is not.
How to actually make the call
If you are not confident which category you are in, that uncertainty is itself worth paying attention to for a while longer before deciding anything. Our piece on what to check when your AI-built app is breaking walks through the specific, common causes worth ruling out first, since some things that look like structural disasters turn out to be one missing setting. If you rule those out and the app still does not add up, that is when it is worth paying for an honest, outside assessment rather than guessing. A proper code cleanup engagement should start with exactly that kind of assessment, telling you plainly which category your app falls into before anyone commits you to a fix, a cleanup, or a rebuild.