How to build a website or app with AI: step-by-step guide

You have an idea for a site, an app, or an online tool, and you do not want to become a developer. This guide gives you a work order: what to decide first, what to write to the AI, when to publish, what to ignore at the start.

Goal: a real first version, not an endless checklist.

Before you start (prepare 4 things)

You do not need a full spec. You do need:

1. A small scope (one main action)
2. A success criterion ("I can do X, refresh, and X is still there")
3. Fake data to test with (not your real clients)
4. A sense of time / credit budget (a useful first pass: often 1–2 hours; something shareable: often more)

Step 0: nail the "what" in one sentence

Complete this:

For [who], I want to create [what], so they can [action].

Examples:

• For my coaching clients, I want a site so they can discover my offer and contact me.
• For my team, I want a tool so they can track client requests.
• For my business, I want an app so users can create an account and book.

If you cannot write that sentence, it is not time to open the editor yet.

Step 1: website or application?

Practical question:

• Website: read, discover, contact, sometimes buy a simple offer.
• Application: sign in, come back, find your info, repeat actions.

Many projects start as a site, then become an app. That is normal. See also What is SaaS, in plain terms?.

Step 2: define an MVP

List one main action. Everything else waits.

MVP examples:

• Get in touch
• Request a quote
• Book a slot
• Create an account and save a first entry

More detail: What is an MVP, and why it matters.

Step 3: list screens, info, and limits

Before generating, turn the flow into a simple table:

Also write the "do not build now" list. The AI tends to "help" by adding too much.

Step 4: ask for a plan (and assumptions) before building

Useful message:

Here is my idea: [step 0 sentence].
Here are the screens and limits: [your table].
Before building, summarize the plan: screens, data collected, main actions, assumptions.
Success criterion: [your test].
Do not build until I validate the plan.

You keep the right to say no. The goal: fix the plan before burning time (and credits).

Step 5: prepare your first creation prompt

Include:

• your business and audience
• essential pages or screens
• tone (simple, premium, warm…)
• what you deliberately leave out
• real copy if you have it
• the success criterion

Example:

Create a site for an independent florist. Audience: individuals ordering bouquets. Pages: home, arrangements, indicative pricing, contact. Warm, clear tone. No online shop for now. Goal: get requests via form. Success: I can send a request and see it again.

Dedicated guide: AI prompt: what it is, and how to write a good one.

Step 6: pick a build order

Two common orders (both work):

Screens first
Best for a site or to validate the offer: pages, copy, visible flow, then accounts if needed.

Connected flow first
Best if the product makes no sense without an account (internal tool, client portal). Still stay minimal: signup + one action, not the whole business suite.

In both cases: one brick at a time, tested before the next.

Step 7: generate, then really test (checklist)

On Index10, you describe your idea in the editor, then watch the preview.

Do not ask for ten changes before navigating once. Use this checklist:

Use fake data. Do not paste real clients, passwords, or service keys in the chat.

Step 8: iterate cleanly (and report bugs clearly)

Chain short messages:

1. Content (real copy)
2. Structure (sections, navigation)
3. Visual details
4. Flow (forms, buttons)

Useful fix template:

I clicked [action].
I expected [result].
I saw [what happened].
Fix only that. Do not change the rest.
Then tell me how to retest.

The 10 tips to build faster with AI help you keep pace.

If you are going in circles

1. Note what already works
2. Summarize current state in 5 lines
3. Ask for one targeted fix
4. If needed: "propose 2 ways to fix this, then apply the simplest"

Tip: keep a mini log ("what I asked / what worked / what broke"). It speeds up the next rounds.

Step 9: enable Index10 Cloud only if needed

If your project needs accounts, saved data, or files (photos, documents), enable Index10 Cloud:

• Cloud tab in the editor → Enable Cloud (often under a minute)
• Or ask the AI: it can suggest activation (you confirm)

It is not required for a showcase site.
Once there is a signed-in space, that is usually the right moment.
Docs: Index10 Cloud.

If you need to connect an external service (payment, email…), keys go in Cloud → Secrets, never in the chat.

Note: Cloud credits (monthly allocation for accounts, data, and files) are not the same as AI credits (conversation). Two separate counters.

Step 10: check before publish

Short checklist:

• Final copy (no more "Lorem ipsum")
• Links and buttons tested
• Useful mentions for your case (contact, legal info if needed)
• If accounts / data: Cloud on, login flow tested, audit requested from the AI
• Publish button: Index10 runs a security scan; critical issues block going live until fixed (security docs)

Publishing does not use AI credits. You usually get a *.index10.app link.

Step 11: soft launch, then widen

Do not aim for "everyone" on day one.

1. Publish a test version (index10.app link)
2. Share with a small circle (clients, colleagues, relevant friends)
3. Note friction points
4. Fix
5. Only then: wider link; custom domain if needed (Pro plan and above)

A real link changes everything: you finally get honest feedback.

Step 12: learn, then enrich

After publish:

• Watch what people actually do
• Note friction
• Add one feature at a time

That is how a site becomes an app, how an MVP becomes a product, without rebuilding everything.

How long does it take?

It depends on how clear your idea is and how much time you have. Many creators get a presentable first version much faster than with classic development. The real work afterward is content, feedback, and adjustments.

Be wary of "in 2 minutes, world domination" promises. Aim instead for: "this week, a useful version online."

In summary

1. One clear sentence + success criterion
2. One MVP + "out of v1" list
3. A validated plan (with assumptions)
4. One brick at a time
5. Test with the checklist
6. Soft launch
7. Learn

If you want to understand the working style behind all this, read What is vibe coding?. Then open Index10 and start with a deliberately simple project. The best way to learn is a real first version.