Describe Your App Idea to AI With No Code: Turn It Into a Screen-by-Screen Brief
Most non-technical people describe their app idea to an AI coding tool in one sentence: "build me an app that does this." Then what comes out is nowhere close to what was in their head. The problem isn't that the AI is incapable, it's that the brief was vague. No developer, human or AI, can read your mind about which screens exist, what order the user moves through them in, or what data gets saved. This prompt turns a one-sentence idea into a spec an AI coding tool can actually build from: which screens exist, what order the user moves through, what information gets saved, which rules apply. It also forces out a separate out-of-scope list, because deciding upfront what WON'T be in version one is what keeps you from spiraling into "oh and this too, and this too" once you start building.
You are a product analyst who works with non-technical founders, turning product ideas into clear technical specs. Your job is NOT to code the app; it's to turn what the user describes in plain language into a brief clear enough to hand an AI coding tool: which screens exist, what order the user moves through them, what data gets stored, which rules apply, and what will NOT be in version one. Use the following information: - Your app idea (in plain language): [what it does, who'll use it, what problem it solves] - How the simplest version should work: [what the user does first when they open the app, what happens step by step] - Who'll use it: [a single user, or multiple people, does everyone have the same permissions] - What information it needs to save: [e.g. a list, a number, a note, a date] - Your technical level: [I don't code / I know a little, I'll be using an AI coding tool] DELIVER THE OUTPUT IN THIS EXACT ORDER, WITH THESE EXACT HEADERS: ═══ ONE-SENTENCE DEFINITION ═══ Summarize the app in a single sentence, in the pattern "[what it does] for [user type] to solve [the problem]." ═══ SCREENS ═══ List every screen the app needs, numbered. For each screen: its name, what the user sees on it, what they can do there. ═══ USER FLOW ═══ Walk through step by step what happens from the moment the user opens the app to the moment they complete one action (in the order they move between screens). While mapping this out, flag any point where the user could get "stuck," meaning any spot where it's unclear how to get to the next step. ═══ DATA AND RULES ═══ List the information the app needs to store (e.g. product name, date, status) and spell out any simple rules that apply (e.g. "if an item runs out, flag it automatically"). ═══ VERSION ONE BOUNDARY (out of scope) ═══ List the features that will DEFINITELY NOT be in version one and should wait for a later release (e.g. multiple users, a payment system, advanced reporting). Explain in one or two sentences why this is necessary to keep version one simple and working. ═══ BRIEF FOR THE AI CODING TOOL ═══ Roll up everything above into a single, flowing paragraph or block that can be copied and pasted straight into an AI coding tool. RULES: - Do NOT use made-up technical terms or unproven timelines/costs like "apps like this usually take X weeks to build." - Do not add a feature the user never mentioned; if information is missing, ask, and state your assumption clearly. - Always make the version-one boundary concrete; "keep it simple" isn't enough, spell out exactly which feature is left out. - For ideas involving payments, user data security, or legal compliance, add an extra warning. - Write in plain English, with no technical jargon, at a clarity level a non-coder can follow.
How to use it
- Describe your idea in plain, everyday language: who's going to use it, what problem it solves, picture what the user does the second they open the app. You don't need technical vocabulary, just give the most concrete example you can (e.g. "it keeps a list, and tapping an item marks it done").
- Run the prompt and picture the screen list and flow it hands back: walk through each screen in your head, and if anything feels missing or off, fix that part and rerun the prompt with the update.
- Paste the spec you're happy with straight into an AI coding tool (a chat-based code generator, for example) and ask for the first build. Don't ask for anything on the out-of-scope list in that first pass, just confirm the core flow actually works first.
Example / tip
Input: Idea = a simple app that tracks daily stock for a small coffee shop · User = the shop owner, single user, on their phone · Simplest version = enter the morning count, enter the evening count, anything that ran out gets flagged automatically. AI output defines three screens: entry screen (morning count), end-of-day screen (evening count), summary screen (which items ran out); lists product name, morning quantity, and evening quantity as the data fields; puts things like "multiple user logins," "automatic supplier ordering," and "reporting charts" on the out-of-scope list and recommends pushing those to version two.
Usage example
Copy the prompt as is, fill in the bracketed fields for your own business, and paste it into ChatGPT or Claude. The more concrete your input, the more useful the output. Take the first draft, ask for a one-sentence fix on whatever you don't like, then give it a final pass in your own voice.
When not to use it
This prompt produces a SPEC, it doesn't build the app for you; the actual coding happens in a separate AI coding tool, and that tool won't always follow the spec to the letter. For anything involving payments, user data security, or legal compliance (health data, privacy law), this spec alone isn't enough. Talk to someone qualified on that specific piece.
Output quality checklist
- Does every screen actually map to a need mentioned in your idea, or did an unnecessary screen sneak in?
- Does the user flow (from first open to done) follow a sensible order, or is a step missing?
- Does the out-of-scope list actually contain things you don't need for version one, or did a core need get left out by mistake?
- Does the data/rules list match what you actually need, or did it suggest something needlessly complex?
