How to Build a SaaS with Next.js in 2026 (Step by Step)
By make1day · Updated 2026-11-07
Building a SaaS in 2026 still means solving the same 60% of commodity problems every founder hits: sign-up, a database, billing and a signed-in area. The difference between founders who ship and founders who stall is rarely the idea — it is how fast they stop rebuilding that 60%.
Start with the 60% that is commodity
Every SaaS needs the same backbone: authentication, a database with row-level security, subscription billing with webhooks, a dashboard and a deployment story. None of these are your differentiator. Pay that toll once, with infrastructure you can read and change.
Pick a stack that already has it
Next.js 15 (App Router) + TypeScript + Tailwind is the default for a reason: the tooling, hiring pool and examples already live there. Pair it with Supabase for auth and Postgres. For billing, decide early whether you want one gateway or a switchable layer — a global launch often needs a Merchant of Record plus a fallback provider. make1day ships six adapters (Waffo Pancake by default, plus Waffo Acquiring, Stripe, Creem, PayPal and Lemon Squeezy) behind one checkout and webhook contract.
Add the one thing that is yours
The common mistake is over-building the demo. Ship ONE real AI feature behind auth and a plan gate — a streaming chat endpoint, document Q&A, a summariser — and leave the rest as honest scaffolding. Customers buy the 40% specific to them.
Generate instead of deleting
If you know up front which modules you need, a configurator that prunes unselected code beats a starter you have to strip by hand. In make1day the Builder picks auth, gateway, AI providers, features, deploy target and visual style; the server returns a ZIP containing only those modules. Eighteen representative combinations are downloaded and type-checked in CI, and the ZIP is brand-free: our marketing pages and the generator itself are removed.
Ship, then charge
Start from a free or preview tier, wire a test checkout, and only ask for money once customers get value. The scaffolding should take you from configuration to a deployed, billable app in an afternoon — not a quarter.
FAQ
How long does it take to build a SaaS with Next.js?+
The commodity backbone (auth, database, billing, dashboard) is what takes weeks. With a starter it is an afternoon of configuration; the remaining time is your actual product, which no template can shorten.
Do I need Supabase?+
No. make1day switches between Supabase (auth + Postgres) and a local SQLite store depending on whether SUPABASE_SERVICE_ROLE_KEY is set. SQLite is for local development — the local auth path has no MFA, OAuth or session rotation, and does not persist on serverless.
Which payment gateway should I start with?+
If you sell globally without a company entity, a Merchant of Record such as Waffo Pancake or Lemon Squeezy removes tax handling. If you already have a Stripe account, use Stripe. The generated app keeps checkout and webhooks behind one provider-agnostic contract, so switching later is a config change.
All frequently asked questions · Markdown version (for AI agents)