Text to UI: Design App Screens From Prompts

Text to UI works best when your prompt names the platform, one screen, and one user goal; supplies the exact labels and content; and sets explicit visual and platform constraints. Ask for a single iOS or Android screen first, such as “Android Material 3 medication reminder list for a user checking today’s doses,” then provide real rows, button copy, palette, type scale, and density. Change one component per revision instead of regenerating the screen. Before handoff, a designer must still verify task flow, accessibility, content states, and implementation details.

Key takeaways

•Name one platform, one screen, and one user goal in every text to UI prompt.
•Use exact labels such as “Add medication” instead of placeholder text such as “Button.”
•WCAG 2.2 AA requires a 4.5:1 contrast ratio for normal-size text.
•Apple recommends a minimum 44 × 44 pt hit target for interactive controls.
•Material Design recommends touch targets of at least 48 × 48 dp for interactive elements.

This guide is for mobile product designers, founders, and engineers who can describe a screen’s purpose but need to turn that description into a usable first UI draft.

Time: 25 minutes · You'll need: floow.design workspace, A written screen brief with approved product copy, Apple Human Interface Guidelines and Material Design 3 references, A contrast checker that reports WCAG 2.2 ratios

What's on this page

•Name the platform, screen, and user goal
•Provide real content for the prompt to app design
•Set constraints for the ai UI generator
•Revise one element to generate app screens AI can refine
•Run the human pass before developer handoff
•Reference table

•Common mistakes
•FAQs

Writing a text to UI prompt, step by step

1. Name the platform, screen, and user goal

Start the prompt with a three-part scope statement: platform, screen type, and the job the person is completing. Write “iOS, order-tracking detail screen, for a customer checking whether today’s grocery delivery is on time” rather than “delivery app screen.” The first version gives the generator a navigation model, an information hierarchy, and a task boundary. The second can produce a generic home feed, map, or checkout.

Keep the request to one screen and one primary goal. If the delivery detail needs a map, ETA, courier contact, and issue reporting, ask for the tracking detail first. Do not ask for onboarding, account management, and checkout in the same prompt. State the platform explicitly even when your product ships on both: create an iOS version and an Android version as separate outputs. Apple and Material 3 have different component names, spacing habits, navigation patterns, and touch-target guidance.

End this part with a success condition: “The user can confirm the delivery window and contact support without leaving the screen.” That condition tells you whether the resulting hierarchy serves the task.

Tip: Use the screen name from your product’s navigation map so design, engineering, and analytics refer to the same destination.

2. Provide real content for the prompt to app design

Replace every placeholder with content that could appear in the build. Include the screen title, primary action, secondary actions, row labels, dates, prices, status text, and a realistic long value. For example: “Title: Delivery tracking. Status: ‘Arriving today, 6:10–6:30 PM.’ Primary button: ‘Message courier.’ Secondary link: ‘Report an issue.’ Order: ‘2 bags · $43.80.’ Address: ‘18 Market Street, Apt 4B.’”

Real copy exposes hierarchy problems that lorem ipsum hides. “Message courier” may require a full-width button, while “Report an issue” should not visually compete with it. A long address reveals whether the layout wraps safely. Include at least one long label or value in the initial prompt; it is a quick stress test for truncation and row height.

Specify empty, loading, or error content only when that state is the screen being designed. For a usable first screen, request the default populated state and name the assumed data condition: “Show an active order with a courier assigned.” Do not ask the generator to invent product terminology when approved copy exists.

Tip: Include the verb users see on the control—“Save reminder,” not “Save”—when the screen contains more than one possible object.

3. Set constraints for the ai UI generator

State the visual system as constraints, not adjectives. Name a palette with roles, a type treatment, density, and platform conventions. A useful constraint block is: “Use Material 3 components; light surface; primary #1455D9; error #B3261E; compact list density; one primary filled button; 16 dp horizontal screen padding; support dark mode tokens.” Only state values that belong to your product system; do not invent a scale because a generator needs one.

For iOS, request Apple conventions by name: “Use an iOS navigation bar, a large title only if this is a top-level destination, and SF Symbols where a system icon is needed.” For Android, request Material 3 components such as a top app bar, cards only when grouping adds meaning, and a bottom navigation bar only for peer top-level destinations. Avoid asking for a “modern” interface. That word has no testable outcome.

Set an accessibility floor in the prompt: normal body text must meet WCAG 2.2 AA 4.5:1 contrast, and interactive controls need enough target area for the selected platform. Apple recommends 44 × 44 pt targets; Material recommends 48 × 48 dp touch targets. These constraints prevent a polished-looking but unusable draft.

Tip: If brand colour fails 4.5:1 against the chosen surface, reserve it for non-text decoration or change the shade before asking for variants.

4. Revise one element to generate app screens AI can refine

Treat the first output as a hypothesis, then issue a delta request that changes one named element. Use: “Keep the iOS tracking screen unchanged. Replace the status card with a plain status section below the navigation bar. Preserve all copy, colours, and actions.” This isolates the effect of the requested decision. It also gives your team a version they can compare directly with the previous screen.

Change one of these at a time: information order, one component type, button emphasis, spacing density, colour role, or copy. Do not combine “make it warmer, simpler, more accessible, and more premium” in one revision. None of those requests identifies a measurable design operation, and a wholesale regeneration can silently alter labels, hierarchy, and platform patterns that were already correct.

Keep a short decision log with a version number and the exact delta. After 3 unsuccessful variants of the same element, stop prompting and decide the rule manually—for example, whether the support action belongs in an overflow menu or in the visible screen body. The generator can produce options; it cannot resolve a product trade-off without a decision owner.

Tip: Ask the tool to preserve named content verbatim when testing layout, otherwise copy drift can make two variants impossible to compare.

5. Run the human pass before developer handoff

Do not hand off generated pixels as a complete specification. A designer must test the primary task from the preceding screen through the next outcome, then define loading, empty, offline, permission-denied, and error states where the feature can encounter them. Check every visible label against approved product copy and verify that destructive actions have an appropriate confirmation or recovery path.

Run accessibility checks on the actual screen design. Normal text needs 4.5:1 contrast at WCAG 2.2 AA; inspect controls against the platform target guidance of 44 × 44 pt on iOS and 48 × 48 dp on Android. Check reading order, meaningful accessible names for icon-only controls, text enlargement, and whether colour is the only carrier of status. A red “Late” badge also needs the word “Late,” not colour alone.

For engineering, annotate component states, spacing tokens, truncation behaviour, asset source, and navigation destination. Specify whether a button is disabled, loading, or unavailable; a static generated image cannot communicate those implementation states. The handoff is ready when a developer can build the normal and failure paths without guessing.

Tip: Review the screen at the smallest supported device width before approving a layout based on a large phone canvas.

Reference table

Accessibility checks before mobile handoff

Check	Requirement or guidance	Apply to
Text contrast	4.5:1 minimum	WCAG 2.2 AA normal text
iOS control target	44 × 44 pt	Apple HIG guidance
Android touch target	48 × 48 dp	Material guidance

Common mistakes

Prompting for “a clean finance app dashboard.”

Name the platform and one task instead: “Android Material 3 bill-payment confirmation screen for reviewing a scheduled payment.” A dashboard is a screen category, not a user goal.

Using “User Name,” “$0.00,” and “Lorem ipsum” in the source prompt.

Provide approved labels and realistic values, including one long value. Real content reveals wrapping, action priority, and whether the proposed component fits the data.

Regenerating the whole screen to move one action.

Issue a delta request that preserves content and all unaffected layout rules. Compare the two versions against the same task success condition.

Treating an iOS-looking screen as ready for Android.

Generate a platform-specific version and review it against Material 3 components and Android touch-target guidance. Do the equivalent Apple HIG review for iOS.

Frequently asked questions

What should I include in a text to UI prompt?

A text to UI prompt should state the platform, one screen, one user goal, exact content, visual constraints, and a success condition. Name real labels, values, and actions rather than placeholders. Add platform conventions such as iOS navigation bar or Material 3 top app bar, plus constraints such as compact density and WCAG 2.2 AA text contrast.

Can an AI UI generator create production-ready app screens?

An AI UI generator can create a useful first screen, but it cannot replace the human review required before production handoff. A designer still needs to validate task flow, states, approved copy, accessibility, responsive behaviour, and implementation details. Generated output is strongest as a fast visual hypothesis, not as an unreviewed product specification.

How detailed should a prompt to app design be?

A prompt to app design should be detailed enough that two designers would build the same screen hierarchy and copy. Include the platform, screen name, task, visible text, data condition, primary action, palette roles, density, and named component conventions. Do not add unrelated screens or speculative edge states to the first request.

How do I ask AI to generate app screens without generic templates?

Ask AI to generate app screens for one named user goal with exact product copy and named platform conventions. “Create a mobile shopping screen” invites template output; “Android Material 3 order-tracking detail for an active grocery delivery, with ‘Message courier’ as the primary action” gives the model task-specific constraints. Iterate a single component after the first output.

What accessibility checks belong in an AI-generated mobile UI handoff?

An AI-generated mobile UI handoff needs contrast, touch-target, readable-text, non-colour status, and accessible-name checks. WCAG 2.2 AA sets a 4.5:1 minimum for normal text, while Apple guidance uses 44 × 44 pt targets and Material guidance uses 48 × 48 dp targets. Also define loading, disabled, error, and empty states rather than handing over one static image.

Where this leaves you

A useful generated screen starts with a bounded request, not a clever phrase. Name the operating system, identify the exact screen, and state what the user must achieve there. Then give the generator the words people will read and the constraints the product must obey. This makes the first output reviewable: you can judge its hierarchy, content fit, platform alignment, and accessibility against known rules. Preserve what works and revise one explicit element at a time. Your next action is to take one current screen brief and rewrite it as a prompt containing its platform, goal, visible copy, palette roles, density, and primary action.

Design the screens first

Describe the screen you need in plain English and floow.design generates production-ready iOS and Android layouts you can iterate on by chat, then export to Figma or code. Design your mobile app screens in floow.design first, then build.

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