How much does it cost to build a web app with AI?
A working product — accounts, a database, real logic — not a static page.
Do it yourself with AI — step by step
- 1
Write a one-page spec first (AI can help): core flow, the 3–5 screens, data model, auth needs — brief quality drives output quality.
- 2
Scaffold the full app from a prompt in Lovable, Bolt.new, or Replit Agent (e.g. 'task tracker with email login, projects table, CRUD, dashboard; React + Supabase').
- 3
Wire auth + DB + storage with Supabase; have AI generate SQL migrations + Row-Level-Security rules, then review them.
- 4
Move to Cursor (Claude Opus 4.8 / GPT-5.5 Agent mode) on the same repo for serious logic, refactors, multi-file changes, and tests.
- 5
Add payments/business logic — integrate Stripe (checkout + webhooks); keep secrets in env vars, never client code.
- 6
Test and harden: AI writes tests, then you QA real flows and reproduce on the deployed build (dev returns 200 even when SSR throws).
- 7
Deploy on Vercel or Replit, add error monitoring (Sentry) and basic rate limiting before going public.
Best AI tools for this
Updated 2026-06-29 — generative-media tools move fast.
Chat-to-full-stack MVP (React + Supabase)
Free / $25 / $50
AI code editor for control + maintainability
Free / $20 (Pro+ $60, Ultra $200)
Prompt-to-app with built-in hosting/DB
$25 Core / $100 Pro
Postgres + auth + storage backend
Free / $25 Pro
Where AI ends and you (or a pro) begins
Scaffolding, UI, CRUD, boilerplate auth, first-pass SQL, test stubs, deploy config.
Security (RLS, real sessions — a 200 ≠ a session), payment/webhook correctness, data integrity, performance at scale, non-trivial business logic.
When it handles payments, sensitive data, or auth at scale; must be secure and maintainable; needs custom integrations; or AI starts breaking working features on each change.
Find a pro on Fiverr ($130–$1500) →Compare every AI model, estimate your build cost, and get a model recommendation.