From idea to a live website or app: the step-by-step roadmap

You can now build far more yourself than you could a few years ago. AI coding tools like Claude Code write and explain the code, and services like Supabase and Stripe handle the parts that used to need a specialist: databases, logins and payments. What most people get stuck on isn't the code. It's knowing what to do, in what order, and what "live" actually requires.

This is the map. The rest of the Build it yourself series goes deep on each step.

Define the one job

Write one sentence: who it's for, what it lets them do, and how it makes money. For example: "Personal trainers use it to send clients a weekly plan, and pay a monthly subscription." Then sketch the three screens that sentence needs. Anything that isn't on those screens waits for version two.

If you haven't tested the idea with real people yet, start with how to validate an idea before you build it. It's the cheapest step in this whole roadmap.

Website, web app or mobile app?

A website is pages people read: your business, your offer, your blog. No logins. A site builder or a simple coded site is enough.
A web app is something people use: they log in, save things and maybe pay. It runs in the browser on phones and computers. This is where most ideas should start.
A mobile app lives in the App Store and Google Play. It costs more to build and update, and the stores review every release. Start as a web app; build native apps once people are using it and you know why they'd need one.

Choose a simple, proven stack

Boring, popular tools are the right choice: they're well documented, they have free tiers to start, and AI coding tools know them well. A stack that works for most web apps:

Frontend: React with Next.js or Vite. This is what people see and click.
Database and logins: Supabase, a hosted Postgres database with sign-up, login and file storage built in.
Payments: Stripe, for one-off payments and subscriptions.
Hosting: Vercel or Netlify. They publish your site every time you save to GitHub.
Domain: any registrar, pointed at your host.
Email: a transactional email service for receipts, password resets and notifications.

Set up your tools

You'll need a code editor (VS Code is free), a GitHub account to store your code and its history, Node.js, and an AI coding assistant. Part 2 covers setting up Claude Code, and part 3 covers how to ask it for what you want. That skill makes the biggest difference to how this goes.

Build the core screen first

Start with the screen that does the one job, using made-up data. Don't start with the login page, the settings page or the logo. Get the core feature working and in front of a few people while it's still cheap to change. Then replace the made-up data with real data.

Add accounts and data

Once the core screen works, add sign-up and a real database so each person sees only their own things. Part 4 walks through Supabase, including the one security setting you can't skip.

Take payments

Add a pricing page and Stripe Checkout, and let Stripe tell your app when someone has paid. Part 5 covers one-off payments, subscriptions and testing without real money.

Connect everything else

Email, analytics, AI features, maps, shipping: most of what's left is connecting other services through their APIs. Part 6 shows how to do it without leaking your keys or your budget. Part 7 covers earning commission by recommending other products.

Go live

Connect your GitHub repository to your host and deploy.
Add your secret keys as environment variables in the host's settings, never in the code.
Point your domain at the host (usually an A record and a CNAME), and HTTPS is set up for you.
Switch Supabase and Stripe from test settings to live ones, and update your allowed redirect URLs.

Run it like a business

Legal pages: a privacy policy and terms of use. If you collect personal information, you need to say what you collect and why. Get advice for your situation.
Backups: know what your database plan backs up and how to restore it.
Error monitoring: get alerted when something breaks, before customers tell you.
Analytics: measure the one action that matters, not just visits.
Support: a real inbox someone checks, and a reply-time promise you keep.

Launch checklist

The core job works on a phone and a computer.
Sign-up, login, password reset and logout all work.
A test payment and a refund both work in live mode.
Each user can only see their own data (test with two accounts).
No secret keys in the code or in the browser.
Privacy policy, terms and a contact method are on the site.
You get an alert if the site goes down or throws errors.

If you'd rather have it built, or want someone to review what you've built before launch, that's exactly what DevTrust's design and build phases are for.