How to write prompts that build great apps

builder77 can build a working app from a single sentence. But a single sentence leaves a lot of decisions to the AI: who the app is for, which screens matter, what data it stores, and what it should feel like. The more of those decisions you make up front, the closer the first version lands to what you had in mind — and the fewer credits you spend correcting it.

This guide walks through a prompt structure we use ourselves. It isn't magic, it's just a checklist that makes sure the important things are said.

1. Start with who it's for and what job it does

"A booking app" could mean a hundred different things. "A booking app for a two-person hair salon where clients pick a service, a stylist and a time slot" can only mean a few. Lead with the user and the job, in one or two sentences.

Build a booking web app for a small hair salon. Clients choose a service, a stylist and an available time, then leave their name and phone number.

2. List the screens or sections

Naming the screens gives the AI a skeleton to fill in. For a website, list the sections in order. For an app, list the main views and how people move between them.

• Website: hero, services with prices, team, testimonials section (you'll fill it later), opening hours, booking form, footer with map link.
• Web app: dashboard, list view with filters, detail page, create/edit modal, settings.
• Mobile app: bottom tabs for Today, Plans, Progress and Profile, plus a bottom sheet for adding entries.

3. Describe the data

Every builder77 app has a built-in database, so the AI will store data in collections. You'll get a cleaner app if you say what those collections are and which fields matter. You don't need technical language — plain nouns work fine.

Store bookings (service, stylist, date, time, client name, phone, status) and services (name, duration, price). Seed a few example services.

If each user should only see their own records — a journal, a habit tracker, a personal budget — say so explicitly: "users sign up and only see their own entries". builder77 will add sign-in and filter queries to the current user.

4. Give it a visual direction

Style is where generic prompts produce generic results. Two or three concrete words beat a paragraph of adjectives. Mention a mood, a color, and a reference if you have one.

• "Warm and minimal, cream background, terracotta accents, serif headings."
• "Dark dashboard, high contrast, electric green highlights, dense tables like Linear."
• "Playful and rounded, pastel colors, big friendly buttons for kids."

You can also attach a screenshot as a reference. The AI will pick up layout and color cues from the image, so it's a great shortcut when you have something specific in mind.

5. Use Enhance when you're stuck

If you only have a rough idea, type it and press Enhance. builder77 rewrites it into a detailed prompt covering users, screens, data and style. Read it before sending — edit anything that's off. It's a fast way to get from "a fitness app" to a spec you'd actually want.

6. Iterate in small, specific steps

Once the first version exists, resist the urge to send a list of twelve changes. Small requests are more reliable and easier to undo. A good rhythm is one feature or one visual change per message.

• Use Select to click an element in the preview and say exactly what to change about it.
• Use Discuss mode to plan a bigger feature with the AI before building it.
• If something breaks, press Fix with AI — it sends the captured error so the AI can repair it.
• Every change is a version. If you don't like a result, restore the previous one and rephrase.

A complete example

Build a mobile habit tracker called Streaky for people building small daily habits.

Screens: Today (list of habits with a big check button and current streak),
Habits (add/edit habits with name, emoji, color and target days per week),
Stats (weekly completion chart and best streak), Profile (sign out).

Data: users sign up; habits and check-ins are private to each user.

Style: calm and friendly, off-white background, soft green accent,
rounded cards, large touch targets, bottom tab bar.

That's about 80 words, and it answers every question the AI would otherwise have to guess. Try the structure on your next idea — and keep your best prompts somewhere handy, because you'll reuse the patterns more than you think.