How to Build a SaaS in 24 Hours
The realistic hour-by-hour plan for shipping a SaaS MVP in one day — AI generation for the app, managed services for auth/payments/database, and the shortcuts that actually hold up.
Top picks
Which tool should you pick?
Quick decision guide based on your situation.
Fastest full-stack generation
Bolt.new + Supabase + Stripe
Visual control while building
Lovable + Supabase + Lemon Squeezy
Developer-quality frontend
v0 + Claude Code + Supabase
Zero tax/compliance work
Merchant of record (Lemon Squeezy) instead of Stripe
Already have a Next.js repo
Skip builders, use Claude Code directly
Tool combinations that work together
How to combine multiple tools for a complete workflow.
The classic 24h stack
Bolt.new + Supabase + Stripe + Vercel + Resend
Generate full-stack, managed everything else. ~$30/mo to run. The stack our weekend plan is built on.
Non-engineer path
Lovable + Supabase + Lemon Squeezy
Visual building with MoR payments — no tax compliance to handle, slightly higher fees.
Engineer path
v0 (UI) + Claude Code (logic) + Supabase
Best code quality at the cost of more hands-on time — closer to 24 focused hours than 24 clock hours.
FAQ
Can you really build a SaaS in 24 hours?
A credible MVP, yes — with three constraints. First, the 24 hours buys you the product skeleton: landing page, auth, one core feature, payments, deploy. Second, it assumes AI generation (Bolt, Lovable, or v0 + Claude Code) doing the bulk of code. Third, everything undifferentiated must be a managed service: Supabase for database and auth, Stripe or Lemon Squeezy for payments, Resend for email. The result is a real product you can charge for on day one and harden in week one.
What's the hour-by-hour breakdown?
Hours 0-2: scope ruthlessly — one user, one problem, one feature. Hours 2-8: generate the app with Bolt/Lovable (full-stack) or v0 (frontend) — auth pages, the core feature UI, basic dashboard. Hours 8-14: wire the real services — Supabase project, payment checkout, transactional email. Hours 14-18: deploy to Vercel, custom domain, analytics (Plausible or PostHog). Hours 18-24: fix the ten things that matter (error states, empty states, the happy path), then launch.
Which AI builder should I use?
Bolt.new if you want the entire stack generated including backend; Lovable if you prefer visual control while building; v0 if you're a developer who wants design-grade frontend and will wire the backend yourself. Our full comparison of the three is linked from this page. The common failure isn't the tool — it's re-generating instead of iterating. Lock the scaffold early, then edit deliberately.
What should I NOT build in the first 24 hours?
Team features, roles and permissions beyond admin/user, custom billing logic (use Stripe Checkout or a merchant-of-record), self-hosted anything, and your own analytics. Every hour spent on these in day one is an hour not spent finding out if anyone wants the product.
How much does it cost to run?
The starter stack runs $25-35/month: Vercel free/hobby tier to start, Supabase free tier up to real usage, Stripe is percentage-only, Resend free tier covers early email, domain ~$12/year. The full 'Build a SaaS' stack breakdown with costs is linked below — expect roughly $30/month until you have paying users.
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