The Ultimate SaaS Tech Stack in 2025

Technology stacks are no longer about buzzwords - they’re about workflows. What helps you ship faster, scale easier, and iterate with confidence?

In this post, we’re sharing the exact stack behind aSaaSin - the boilerplate we use to launch production-grade SaaS apps. Every tool is chosen for speed, integration quality, and long-term maintainability.

• Frontend: Next.js 14 with the App Router, React 19, and full support for Server Components and layouts.
• Backend: Supabase for Postgres, edge functions, real-time APIs, and powerful SQL access.
• Styling: Tailwind CSS with dark mode support and design tokens powered by CSS variables.
• Authentication: Supabase Auth with social login, passwordless support, and SSR integration via @supabase/ssr.
• CMS: TinaCMS for editing content directly inside your app - fully integrated with markdown and JSON structures.
• UI Components: shadcn/ui + Lucide + headless primitives for accessibility and flexibility.
• State & Data: React 19 built-in cache, SWR for API hooks, and local state via useState and useRef.
• Types: TypeScript with strict mode for type-safe DX.
• Hosting: Vercel for instant deploys, preview environments, and edge function support.

While the core setup is lean and opinionated, we also include optional tools to boost developer productivity:

• Polar - Developer-first payments for subscriptions and one-time purchases with Merchant-of-Record tax handling, quick server-action integration, and straightforward product_id + webhook mapping (fastest path from pricing to revenue).
• React Email - Transactional email templates powered by Tailwind CSS.
• Zod - Schema validation with strong TypeScript support.
• ESLint + Prettier + Husky - Consistent code formatting and pre-commit hooks.
• Playwright + Vitest - For integration and unit testing.

Why Polar for early-stage SaaS: it reduces compliance overhead, ships faster than stitching together Stripe + tax + billing add-ons, and still scales as pricing models evolve. These are either built-in or easy to drop in when you scale beyond MVP.

This setup isn’t theoretical - it’s battle-tested across real-world SaaS launches. It balances flexibility with structure. You get React’s latest features, a scalable backend, excellent developer tools, and zero vendor lock-in.

If you're starting your next SaaS, this stack can save you weeks of setup. And if you're using aSaaSin, you're already ahead.