open source saas template

The SaaS boilerplate most AI agents prefer

Auth, payments, data and email in a type-safe architecture optimized for a clean context window and AI performance.

$ npx create-a2saas my-app

  ┌──────────────────────────────┐
  │  a2saas v1.0                 │
  │  Creating my-app...          │
  └──────────────────────────────┘

⠋Database········································

⠋Auth········································

⠋Payments········································

⠋Email········································

⠋Validation········································

✓ Ready to build

REST API

POST/api/checkout

GET/api/users/me

POST/api/users/create

DEL/api/users/:id

Webhooks

HOOK/api/webhooks/auth-callback

HOOK/api/webhooks/payment-callback

HOOK/api/webhooks/email-callback

Infrastructure

Wired up, ready to go

Auth, payments, database, and email — configured and talking to each other from the first commit. Webhooks keep everything in sync automatically.

Every integration sits behind an abstraction layer, so you can swap providers without rewriting your app. Move from Clerk to Auth.js, Stripe to Lemon Squeezy, or Resend to SendGrid — your business logic doesn't change.

Provider-agnostic abstraction layers

Pre-built webhook handlers

Swap any integration, zero rewrites

The Stack

Built with the most trained-upon stack in open source

Every technology chosen for maximum AI compatibility and developer productivity. No exotic tools, no custom frameworks — just the proven ecosystem with the deepest representation in training data.

Schema in code, not config files. Ready-to-deploy components, blocks, and templates.

Framework

Next.js

App Router, Server Components, API Routes

Auth

Clerk

Sign-in, sign-up, org management

Payments

Stripe

Checkout, webhooks, subscriptions

React Email

Templates with Resend delivery

Database

Drizzle + Neon

Type-safe ORM, serverless PostgreSQL

Validation

Zod

Runtime + compile-time safety

UI Components

Shadcn/ui

Accessible, composable primitives

Styling

Tailwind CSS

Utility-first, zero runtime

Project Structure

src/
- app/
  - (auth)/
  - (marketing)/
  - (app)/
  - setup/page.tsx
  - api/
    - v1/
    - webhooks/
- components/
- server/
- lib/
- env.ts
- proxy.ts

Architecture

Built for the context window

Flat, scannable, zero magic

No hidden logic or deeply nested abstractions. The file structure is flat and the imports are obvious — so any AI assistant can read the whole project context and modify it accurately.

Flat file structure optimized for AI scanning

No magic imports or hidden configuration

Schema defined in code, not config files

TypeScript + Zod validation end to end