Anyone can wire an image model to a phone mockup. Several products already have, and their output all looks the same. AppStage exists for the part that makes output stop looking templated.
What actually happened
We built the obvious version first. Scrape the app, write a brief, prompt a good image model, drop the real screenshot into a device frame. It worked. It produced six competent, perfectly clean panels — and the first person who looked at them said they were very lame and boring.
They were right. Nothing was broken. The lighting was fine, the type was fine, the device was straight. It was just the same composition three times, which is what every tool in this category produces, because it is what the model reaches for when nothing stops it.
What fixed it was not a better model and not a longer prompt. It was structural constraints that make the boring composition unavailable — an archetype has to be chosen, the device cannot be centred and upright by default, and a set cannot repeat an arrangement. That work is the product. The image model is a component.
What we believe
01
The screen is a photograph
Whatever art direction happens around your app, the app itself is reproduced exactly. No invented buttons, no hallucinated labels, no plausible-looking numbers that were never in your product. A screenshot that lies about your app is a rejection risk before it is a design problem.
02
Taste is enforced in code
A phone floating in the middle of a pale gradient with a headline above it is what you get when you wire the obvious pipeline and accept the first result. We forbid that composition structurally rather than hoping a longer prompt talks the model out of it.
03
Panels are rendered together
A set is rendered as one wide image and then cut, so the panels share lighting and palette by construction. Rendering them one at a time and hoping they match does not work, and you can see it in most of the sets on the store.
04
Never invent a number
No fabricated ratings, download counts, streaks or review quotes inside a device screen. Apple and Google both treat that as misrepresentation, and it is the single easiest way to get a listing pulled.
Who it is for
Developers and small teams shipping to the App Store and Google Play who need a listing that looks designed, and who do not have a designer on call for every release. You bring real screenshots. You get finished panels at every required size, an icon, and store copy — reviewed in a page that looks like the store itself, because that is the only place the work can honestly be judged.
Where we are
Early, and saying so. The render pipeline, the canvas editor, Icon Studio and the App Store Connect publishing path are built. Direct publishing to Google Play is not — you export the files and upload them yourself. The changelog is the honest version of what landed when.