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How to describe the design you want: prompts for UI and branding

How to describe your app's design to AI: hex colors, Arabic fonts, spacing, RTL rules and screen-by-screen prompts. Simple design vocabulary for non-designers.

Fanann Team8 min read
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Quick answer

To get the design you want from AI, describe five things precisely: the overall feel in three words, colors as hex codes (such as #0F5132), the Arabic and English fonts, spacing density and component shapes (corners, shadows), and RTL rules. Start with one prompt that sets the whole design system, then refine each screen in short messages describing what you see and what to change.

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How do you describe the design you want to AI?

To describe the design you want to AI, turn taste into decisions: three words for the feel, colors as hex codes, a named font, clear spacing and shapes, and RTL rules. 'I want it premium and modern' means something different to everyone. 'Calm, premium, comfortable; light beige background #F7F3EC, dark green primary #0F5132, IBM Plex Sans Arabic, generous spacing and softly rounded corners' gives the agent something it can execute literally.

You do not need to be a designer. You need some vocabulary and an orderly method: a design system first, then screens one by one, then a review. This article gives you all three with ready prompts.

AI cannot read your taste; it reads your words. Make the words precise.

Simple design vocabulary for non-designers

These are the most useful words when asking for interface changes. Use them in Arabic or English; the model understands both.

What you meanThe precise wordIn a prompt
The page is crowdedWhitespaceMore space between sections, fewer items on the first screen
I do not know where to lookVisual hierarchyMake the title and price stand out more than the description
The box around a productCardCards with 12px corners and a light shadow
The big first sectionHeroA full-image hero with a headline and one button
The important buttonCall to action (CTA)An 'Order now' button in the primary color, full width on mobile
Text is hard to readContrastRaise the contrast of grey text on the light background
It changes on mobileResponsive designOne column on mobile, three on desktop

The design system prompt: your brand in one message

Before editing any screen, lock in the design system: colors, fonts, spacing and shapes. With a clear system, every new page the agent builds stays consistent automatically. If you have a logo, get its exact hex codes from your brand file or designer.

Design system prompt (adjust the values)

Apply this design system to the whole app: Feel: calm, premium, trustworthy. Colors: background #F7F3EC, primary #0F5132 for buttons and links, gold accent #B08D57 for highlights only, main text #1F2933, secondary text #52606D, errors #B42318. Fonts: IBM Plex Sans Arabic for Arabic and Inter for English, 16px body text on mobile, headings at weight 600. Spacing: an 8px scale, generous space between sections. Shapes: 12px corners on cards and 10px on buttons, very light shadows, no gradients. Direction: Arabic RTL first, English LTR when the language is switched. Add a dark mode with the same identity. Do not change content or logic; design only.

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A note on fonts: popular free Arabic fonts such as IBM Plex Sans Arabic, Noto Kufi Arabic, Tajawal and Cairo are designed for screens and pair well with English. Pick one Arabic font and a matching English one, and never mix more than two.

Choosing colors if you have no brand yet

  • One primary color for buttons and links, repeated on every page.
  • An accent color for highlights only (a discount badge, an icon), never for long text.
  • Neutrals for backgrounds and text: white or light beige, and dark grey text instead of pure black.
  • Status colors: green for success, red for errors, yellow for warnings, consistent across the app.

If you plan seasonal campaigns such as National Day or Ramadan, ask for campaign colors on temporary banners and pages, and keep the core design system unchanged.

RTL and Arabic rules you should state

Many tools build in English first and then flip the direction, leaving details that make an app feel foreign to Arabic readers. State these rules explicitly:

  • Directional icons (back and next arrows, an animated cart) mirror in Arabic; logos, play icons and clocks do not.
  • No letter-spacing on Arabic text; it breaks the joined letters.
  • No italics for Arabic; use a heavier weight for emphasis.
  • Arabic needs slightly larger text and taller line height than English to read comfortably.
  • Numbers, phone numbers and prices keep the right order inside Arabic sentences.
  • Email and card-number fields stay left-to-right even inside an Arabic interface.

For the common mistakes in depth, read Arabic-first UX: RTL mistakes.

Screen-by-screen prompts: goal first, then order

After the system, refine key screens one at a time. A format that works: the screen's goal, element order from the top, what should stand out, and what to remove.

  1. 1
    Home page

    'Goal: visitors start an order within seconds. From the top: a hero with an image, a short headline and an Order now button, then categories as horizontal cards, then best sellers. Remove the scrolling text ticker.'

  2. 2
    Product page

    'Photos first at full width, then name and price in large type, then options as buttons rather than a dropdown, then an Add to cart button pinned to the bottom on mobile.'

  3. 3
    Checkout

    'One step where possible: address, payment method with mada, Apple Pay and Tabby icons, summary and pay button. No distracting links.'

  4. 4
    Admin dashboard

    'Four number cards at the top (today's orders, sales, in preparation, cancelled), then a table of recent orders. Calm colors; red only for alerts.'

References and images: use them without copying

Visual references save a lot of words, but 'make it like that app' alone leaves the agent guessing what exactly you liked. Name the thing you liked, and do not ask to copy another brand's identity.

Vague reference
  • 'Like the famous delivery app'
  • 'Nice colors like Instagram'
  • 'I want a professional look'
Useful reference
  • 'One-step checkout with the summary pinned at the bottom'
  • 'An orange-to-pink gradient on primary buttons only'
  • 'Generous spacing, big images, little text, one primary color'

Do not forget image style; it is part of the brand like color. Say what you want: real product photos on plain backgrounds, simple illustrations, or photos of people that suit your audience's culture. Ask the agent for clear image slots with alt text so you can swap in your real photos later without the design changing.

If you have a paper sketch or a screenshot of a rough design, you can turn it into a precise description or use it as a reference; see from screenshot or hand sketch to a working app.

A design review checklist before launch

  • Every screen tested on a real phone in Arabic and English.
  • Enough contrast for grey text and buttons, especially in sunlight.
  • Dark mode does not hide a logo or icon.
  • Buttons are large enough to tap, and forms show clear error messages.
  • Images are compressed and load fast on mobile data.
  • The same colors, fonts and shapes on every page, with no random exceptions.

You can ask the agent to do this review: 'Check every page against the design system and list any differences before changing anything.' For accessibility standards, see accessibility for Arabic apps.

Key takeaways

  • Set one design system (colors, fonts, spacing, shapes) before editing screens.
  • Hex codes and three specific mood words beat 'premium and nice'.
  • Arabic has its own rules: slightly larger text, no letter-spacing, mirrored directional icons.
  • Describe each screen by its goal and element order, and edit one at a time.
  • Review on mobile first, and check contrast, dark mode and accessibility.

Frequently asked questions

How do I describe a design to AI with no design experience?
Start with three mood words, then give hex colors, a font name, corner style and spacing. Use simple terms like card, whitespace, call to action and contrast.
What is the best Arabic font for apps?
There is no single best font. IBM Plex Sans Arabic, Noto Kufi Arabic, Tajawal and Cairo are popular and built for screens. Choose one that reads clearly at small sizes and pairs with your English font.
Should I design all screens in one prompt?
No. Start with a design system prompt for the whole app, then refine key screens one at a time. It keeps things consistent and easy to review.
Why does my Arabic app feel off even though it is RTL?
Usually because of details such as unmirrored icons, letter-spacing, small text or numbers in the wrong order. State the Arabic rules in your prompt and review on mobile.
Can I ask for a design like a famous app?
Name the elements you liked (layout, density, page type) rather than copying the identity. Copying another brand's logo or colors weakens your own brand and can cause legal trouble.
How do I change my app design after it is built?
Send one short message per change: name the screen, what you see now and exactly what you want, and add 'do not change content or logic'. For global changes like colors or fonts, update the design system prompt and reapply it to every page.

Ask your AI assistant about this

Copy this prompt into the AI assistant you use, then add the details of your own case.

I am reading this guide: “How to describe the design you want: prompts for UI and branding” https://fanann.com/en/blog/prompts-for-ui-design/ My question: prompts for ui design with ai Use that page as a source and explain the answer step by step for my situation, tell me what to check before I start, and cite the page link.

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