App screenshot prompts.

The description is the brief

With an AI screenshot generator, the few sentences you write about your app are not a search query. They are the creative brief the headlines, the palette and the composition are all derived from. A vague brief produces vague frames, and no amount of regenerating fixes it — you get a different arrangement of the same emptiness.

The good news is that the fix is small. Four specific things change the output more than everything else combined.

The four things that actually matter

1. What the app does, in plain words

Not your category, not your positioning statement — the actual function. "Tracks workouts and shows your strength progress over time" beats "a fitness and wellness platform." The first can be turned into a headline; the second cannot.

2. Who it is for

The audience changes the entire visual direction. A budgeting app for students and a budgeting app for accountants want different palettes, different tone and different levels of restraint. Say which one you are.

3. The outcome, ideally with a number

This is the highest-leverage sentence you can write, because it is what separates a specific headline from a generic one. "Most users clear their inbox in under ten minutes a day." "Cash lands the same day instead of in three." "People log a workout in about fifteen seconds."

Real numbers survive into the frames as headlines that a competitor cannot copy. Vague benefits produce "Save Time" — the single most common wasted headline in the App Store.

4. Anything that is genuinely fixed

A brand colour you must match. A mascot that has to appear. A claim you are legally not allowed to make. Constraints are useful; preferences mostly are not.

What wastes a prompt

• Style adjectives. "Modern, clean, minimal, premium, beautiful." Every app claims all five, so they carry no information. The visual direction is better set by your category and audience than by adjectives.
• Feature lists. Twelve comma-separated features give the model no idea which one matters. Name the one thing you would keep if you could only show one.
• Your marketing tagline. Taglines are usually abstract by design. "Life, organised" is a fine tagline and a useless brief.
• Instructions about layout. Describing where you want the phone or how big the text should be fights the system rather than steering it. Describe the app; let the composition be handled.
• Length for its own sake. Past about four sentences, extra detail gets averaged out rather than acted on.

Worked examples

Same app, two descriptions. The difference in output is not subtle.

Fitness

Weak: "A modern fitness app with a clean design that helps users stay motivated and reach their goals."

Strong: "A strength-training tracker for people who lift three or four times a week. It logs a set in two taps and shows whether you are actually getting stronger month over month. Most users beat a personal best in their first three weeks."

The second gives the generator an audience, a concrete interaction, a measurable outcome and an emotional payoff. The first gives it nothing but adjectives.

Finance

Weak: "A powerful budgeting app to manage your money easily."

Strong: "A budgeting app for freelancers with irregular income. It sets aside tax automatically as invoices land, so there is never a surprise bill in January. Users typically see their real spendable balance for the first time."

Productivity

Weak: "A task manager that helps you get organised and be more productive."

Strong: "A task manager for people who plan their day the night before. Everything lives on one screen; there are no projects, tags or folders to maintain. Most users clear their list by mid-afternoon."

After the first generation

Do not rewrite the description and regenerate everything because one frame is wrong — you will lose the frames that were right.

Revise the single frame instead: change one headline, ask for a darker background, request a different hero element. The rest of the set stays exactly as it was, which is the whole point of per-frame editing.

Rewrite the description only when the whole set misses — when every frame argues the wrong thing. That is a brief problem, and it is worth fixing at the source.

Frequently asked questions

How long should the description be?

Two to four sentences. What it does, who it is for, what changes for them.

Should I describe the visual style?

Only real constraints, like an existing brand colour. Adjectives are wasted words.

Why are my headlines generic?

Because the description was. Add a concrete outcome, ideally a number.

Do I need a prompt per frame?

No — one description covers the set, and each frame is assigned its own role automatically.