Why This Stack?
Choosing a tech stack for your SaaS is one of the most consequential decisions you'll make. Here's why we chose Next.js 15, Supabase, and Stripe - and why we think it's the best foundation for building SaaS in 2025.
Next.js 15: The Frontend & Backend
Next.js 15 with the App Router gives you:
- Server Components - Fetch data on the server, send HTML to the client. Faster loads, better SEO.
- Server Actions - Mutations without API routes. Type-safe, validated, secure.
- Streaming - Progressive rendering for complex pages.
- Middleware - Auth checks, redirects, and i18n at the edge.
The App Router's async server components mean you can query your database directly in your page components - no useEffect, no loading states, no client-side data fetching.
Supabase: The Database & Auth
Supabase gives you Postgres with superpowers:
- Postgres - The most reliable relational database, hosted for you
- Auth - Email/password, OAuth providers, magic links
- Row Level Security - Fine-grained access control at the database level
- Type Generation - Generate TypeScript types from your schema
We use Supabase's service_role key server-side for maximum security, and the auth client for session management. Our guide to Supabase authentication in the App Router walks through the full setup.
Stripe: The Payment Layer
Stripe handles the hard parts of payments (we cover the implementation details in our guide to adding Stripe payments with Server Actions):
- Checkout Sessions - Hosted payment pages that handle 3D Secure, taxes, and more
- Customer Portal - Let users manage their own subscriptions
- Webhooks - Real-time event processing for payment lifecycle events
- Global Payments - Support for 135+ currencies and dozens of payment methods
How They Work Together
User → Next.js (Server Component)
→ Supabase Auth (verify session)
→ Supabase Postgres (query data)
→ Stripe (payment status)
→ Rendered HTML sent to browser
User → Server Action (mutation)
→ Zod (validate input)
→ Supabase Postgres (update data)
→ Stripe (create checkout)
→ Redirect to Stripe Checkout
The entire flow is server-side. The browser never sees your database credentials, never makes direct API calls, and never handles sensitive data.
The Result
A fast, secure, production-ready SaaS that you can build on with confidence. You can estimate the running costs for this stack using our SaaS tech stack cost estimator. That's what SecureStartKit gives you out of the box.
Built for developers who care about security
SecureStartKit ships with these patterns out of the box.
Backend-only data access, Zod validation on every input, RLS enabled, Stripe webhooks verified. One purchase, lifetime updates.
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