How much does it cost to build an app with AI in the UK?
How much does it cost to build a website or app with AI in the UK? Often less than people expect: you can learn and launch a small project for little more than a domain name. This guide breaks down free tiers against paid plans, item by item, so you can budget honestly before you start.
Prices checked in October 2026 and rounded. AI and software pricing changes often, so check each provider's pricing page before you commit. Some prices are set in US dollars, and VAT may be added at checkout.
The short answer
- Learning and a first website: £0 to about £10 for the year (just a domain).
- A small working app (logins, database, emails): typically £0 to £30 a month while it's small, mostly the AI subscription.
- An app taking payments: the same, plus card fees on each sale.
The biggest cost for most beginners isn't software. It's time. Expect evenings and weekends rather than hours.
1. The AI tools
| Tool | Free tier | Typical paid plan |
|---|---|---|
| ChatGPT + Codex | Yes, with limited Codex access | Plus about £20/month, includes Codex |
| Claude + Claude Code | Chat only; Claude Code needs a paid plan | Pro about £18–£20/month, cheaper annually, includes Claude Code |
| Grok, Grok Bot + Cursor (The X Subscription) | Yes, with a starter allowance | Plus about $8/month; Premium about $30/month adds Grok Bot and more usage |
Free is genuinely enough to learn. You'll hit daily or weekly limits, which is mildly annoying but fine for a first website. Once you're building most evenings, one paid plan at around £20 a month is the sweet spot. Higher tiers (£90 to £200+ a month) are for people coding all day and aren't needed for beginners.
Tip: pay for one plan and use another tool's free tier as your second opinion for reviews and bug-hunting. See Grok vs ChatGPT vs Claude for how they differ.
2. Domain name
A .co.uk or .com domain is your one near-unavoidable cost. Cost-price registrars such as Cloudflare charge roughly £4 to £10 a year for these, with renewals at the same price. Big-brand registrars often advertise a cheap first year and then renew at £15 to £20 or more, so always check the renewal price, not just the first-year offer.
3. Hosting
- Static websites: free on Cloudflare Pages, GitHub Pages or Netlify for typical small sites. Cloudflare Pages' free plan includes unlimited bandwidth and 500 builds a month.
- Apps with server code: Cloudflare Workers has a free daily allowance that covers most small projects; the paid plan starts at about $5 a month if you outgrow it.
4. The app building blocks
| Service | What it does | Free tier | When you'd pay |
|---|---|---|---|
| Clerk | User sign-up and login | Free up to a large number of monthly users | Thousands of active users, or advanced features |
| Cloudflare D1 or Supabase | Database | Free allowance suitable for small apps | Large data or heavy traffic |
| Resend | Sending emails | 3,000 emails/month, max 100/day | About $20/month for 50,000 emails |
| Stripe | Taking payments | No monthly fee | 1.5% + 20p per standard UK card payment; more for premium and international cards |
| GitHub | Saving versions of your code | Free for individuals | Rarely needed for beginners |
Free tiers are designed to let you build and launch. You'll usually only start paying when people are actually using your app, which is a nice problem to have.
5. Mobile app stores (only if you need them)
Most beginners don't need an app store at all. A mobile-friendly web app works on any phone and can be added to the home screen. If you do want to be in the stores, Apple's developer programme costs about £79 a year and Google Play has a one-off fee of about $25. Store review processes also add time.
6. Hidden costs to watch
- Usage overruns: some tools let you buy extra credits when you hit your limit. Set a spending cap, or turn off automatic top-ups.
- API pay-as-you-go: if you set an AI API key in your tools, usage may be billed per token instead of from your subscription. Check which one you're using.
- Currency and VAT: dollar-priced plans move with the exchange rate, and VAT may be added.
- Your time on fixes: rushed builds cost more time later. Small steps and testing are the cheapest habits there are.
Three example budgets
A one-page business website
AI: free tier. Hosting: free. Domain: about £5 to £10 a year. Total: about £5 to £10 for the year.
A booking app for a small business
AI: one paid plan for a month or two while building, around £20 a month. Hosting, database, login and email: free tiers. Domain: about £10. Total: roughly £30 to £50 to build, then close to £0 a month while it's small, unless you keep the AI plan. See how to build a booking app with AI.
A small paid web app
AI: about £20 a month ongoing. Building blocks: free tiers to begin with. Stripe: 1.5% + 20p per UK card sale, so about 95p on a £50 sale. Total: about £20 a month plus card fees, until usage grows.
Is it cheaper than hiring a developer?
For small projects, almost always in cash terms. Freelance quotes for a custom booking system or web app commonly run into hundreds or thousands of pounds. The trade-off is your time and your responsibility: when you build it, you test it, secure it and maintain it. For many people, that's exactly the appeal. You end up with a skill, not just a product.
Start for free
You can try vibe coding tonight for nothing. Read what vibe coding is, then follow how to build a website with ChatGPT or Codex. Pay for a plan only when the free limits start getting in your way.