From Vibe-Coded Prototype to Paying Customers: A Practical Launch Checklist

Vibe coding got you a prototype in days that would once have taken months. That's the good news. The bad news: the prototype was never the hard part of a business. Here's the honest checklist between your working demo and your first invoice — most of it isn't code.

1. Decide what the £1 version is

Not the vision. The smallest thing someone will pay for this month. Cut features until it fits in one sentence: "It does X for Y people." If your landing page needs three paragraphs to explain the product, the product is still too big.

2. Harden the three things AI code gets wrong

AI-assisted code is remarkably good at features and remarkably casual about the unglamorous parts. Before real users touch it, have an agent (or a friend who codes) audit exactly three areas:

• Auth and permissions — can user A see user B's data? This is the classic vibe-code hole.
• Secrets — API keys hard-coded anywhere in the client or the repo history.
• Input handling — what happens with empty, enormous, or malicious input.

You don't need enterprise security. You need to not be embarrassed on day three.

3. Put a real payment rail in front of it

Stripe, Paddle or Lemon Squeezy, wired to a paywall, even if the price is a placeholder. A waitlist measures politeness; a checkout measures demand. Merchant-of-record services (Paddle, Lemon Squeezy) also handle sales tax/VAT for you, which for a solo founder is worth the slightly higher fee.

4. Ship a landing page that answers four questions

What is it, who is it for, what does it cost, what happens when I click? One page, one call to action. Your prototype energy is better spent on ten headline variations than on a settings screen nobody asked for — our landing page guide has the full formula.

5. Price like a business, not an apology

Solo founders systematically underprice. Start at the price that feels slightly uncomfortable, monthly and annual, and remember: at £9/month you need 1,000 customers for a modest salary; at £29 you need a few hundred. Cheap isn't kind — it's just a slower way to quit.

6. Get ten real conversations before you "launch"

Forget the big bang. Find ten people with the problem — in communities you already inhabit, or one warm intro at a time — and watch them use it. Five of those conversations will rewrite your homepage. Two will become your first customers. One will tell you the feature that actually matters.

7. Set up the boring layer the same week money arrives

First payment means you have a business: separate bank account, accounting software, terms of service and privacy policy (AI drafts, you review), and a decision about whether it's time for an LLC or company. An afternoon now, versus a very bad April later.

8. Pick one growth channel and commit for 90 days

SEO content, a newsletter, short video, community presence — any of them can work; none of them work in two weeks. Choose the one you can sustain on your worst week, and judge it after a quarter, not a fortnight.

The prototype proves you can build. The first ten customers prove you should.

We're building out step-by-step guides for each item on this list — join the Monday Briefing and we'll send them as they land.

Frequently asked questions

How do I turn a vibe-coded app into a real product?

Work the gap in order: define the smallest paid version, audit the security basics (auth, secrets, input handling), wire up a real payment provider, ship a one-page landing page with a price on it, then get ten real users in front of it before any public "launch." Most of the gap is positioning and plumbing, not more features.

Is vibe-coded software secure enough for real users?

It can be, but not by default. AI-generated code is strong on features and weak on the unglamorous parts — the classic holes are one user being able to see another's data, API keys left in client code, and unvalidated input. A focused audit of those three areas (an AI agent prompted as a skeptical reviewer works well) covers the launch-critical risks.

What payment provider should an indie founder use?

Stripe if you want maximum control and lowest fees; Paddle or Lemon Squeezy if you'd rather pay slightly more and have sales tax/VAT handled for you as merchant of record. For a solo founder selling globally, the merchant-of-record route usually wins on admin alone.

How much does it cost to launch a vibe-coded SaaS?

Remarkably little: an AI coding tool (~$20–100/month), hosting (often free-tier), a domain (~$10/year) and payment processing (percentage of sales only). The real investment is the unpaid work between prototype and first customer — validation, positioning and outreach.