GitHub - Wittlesus/launchfast-starter: Ship your SaaS in days. Next.js 16 + Auth + Stripe + Prisma + AI + Email. Production-ready boilerplate.

LaunchFast

The only Next.js SaaS starter with production-ready AI chat built-in.

Stop building AI infrastructure from scratch. Ship your AI-powered SaaS this weekend.

One-time purchase. Not a subscription. Lifetime updates included.

Screenshots

Features

• Production-ready AI chat interface at /dashboard/ai-chat with full conversation history
• Streaming responses with Server-Sent Events (SSE) -- see messages as they appear
• Conversation persistence -- all chats saved to PostgreSQL with full message history
• 6 AI personas -- Code Expert, Creative Writer, Business Advisor, and more
• Tier-based rate limiting -- 50 messages/day free, 1,000/day for paid subscribers
• Token usage tracking -- per-message and total usage for cost monitoring
• NextAuth v5 -- Google + GitHub OAuth with Prisma persistence
• Stripe integration -- checkout, billing portal, and webhook handling
• Prisma 6 + PostgreSQL -- complete database schema with migrations
• Transactional email via Resend (welcome emails + custom)
• 80+ Playwright E2E tests -- landing, auth, dashboard, pricing, responsive, SEO
• Per-user rate limiting -- 10 req/min dev, Redis-backed in production
• Input validation -- 4,000 char prompt limit, systemPrompt sanitization
• Full TypeScript -- strict mode, complete type safety
• Landing pages -- hero, pricing, features, social proof
• Legal pages -- privacy policy, terms of service
• Sentry integration -- optional error tracking and monitoring
• Vercel-ready -- deploy in minutes

Why LaunchFast Over Free Alternatives?

Free alternatives like next-forge give you auth + payments + database. LaunchFast gives you that PLUS a production-ready Claude AI integration with streaming, rate limiting, and user-scoped access controls.

If AI is central to your product, LaunchFast saves you 2-3 weeks of infrastructure work.

Quick Start

git clone https://github.com/Wittlesus/launchfast-starter.git
cd launchfast-starter
npm install
cp .env.example .env    # fill in your API keys
npx prisma db push
npm run dev

Open http://localhost:3000 and you are live.

What You Get That Free Boilerplates Do Not

Building an AI-powered SaaS from a generic boilerplate? You will still need to:

1. Integrate the AI SDK (Anthropic, OpenAI, etc.) -- 2-3 days
2. Add streaming support for real-time responses -- 1-2 days
3. Implement rate limiting per user to prevent API abuse -- 2-3 days
4. Build input validation to avoid expensive malicious requests -- 1 day
5. Create a chat UI with loading states and error handling -- 2-3 days
6. Wire up session auth to the AI endpoint -- 1 day
7. Add systemPrompt support for multi-persona systems -- 1 day
8. Set up token tracking for usage-based billing -- 2-3 days

Total: 2-3 weeks of work. LaunchFast gives you all of this out of the box.

Who Should Use LaunchFast?

Use LaunchFast if you are building:

• AI writing tools, content generators, or productivity apps
• ChatGPT-style interfaces with your own data/context
• AI-powered analytics, insights, or recommendation engines
• Customer support chatbots with company-specific knowledge
• Code generation, debugging, or developer tools with AI
• Any SaaS where AI chat is a core feature

Use next-forge (free) if you are building:

• Project management tools, CRMs, or collaboration software
• E-commerce platforms or marketplace applications
• Analytics dashboards without AI features

The Code

Authentication (30 lines, fully configured)

// src/lib/auth.ts
import NextAuth from "next-auth";
import Google from "next-auth/providers/google";
import GitHub from "next-auth/providers/github";
import { PrismaAdapter } from "@auth/prisma-adapter";
import { prisma } from "@/lib/prisma";

export const { handlers, signIn, signOut, auth } = NextAuth({
  adapter: PrismaAdapter(prisma),
  providers: [
    Google({
      clientId: process.env.GOOGLE_CLIENT_ID!,
      clientSecret: process.env.GOOGLE_CLIENT_SECRET!,
    }),
    GitHub({
      clientId: process.env.GITHUB_CLIENT_ID!,
      clientSecret: process.env.GITHUB_CLIENT_SECRET!,
    }),
  ],
  pages: { signIn: "/login" },
  callbacks: {
    session({ session, user }) {
      if (session.user) session.user.id = user.id;
      return session;
    },
  },
});

AI Integration (production-ready)

// src/app/api/ai/route.ts
const message = await anthropic.messages.create({
  model: "claude-sonnet-4-5-20250929",
  max_tokens: 1024,
  system: systemPrompt || "You are a helpful assistant.",
  messages: [{ role: "user", content: prompt }],
});

Session-protected, rate-limited, input-validated, multi-persona ready. See the full implementation in the source.

Project Structure

launchfast-starter/
├── prisma/schema.prisma          # Database models
├── src/
│   ├── app/
│   │   ├── (auth)/               # Login + Signup pages
│   │   ├── api/
│   │   │   ├── ai/               # Claude AI endpoint
│   │   │   ├── auth/             # NextAuth route handler
│   │   │   └── stripe/           # Checkout, portal, webhooks
│   │   ├── dashboard/            # Protected dashboard + AI chat
│   │   ├── pricing/              # Pricing page
│   │   └── page.tsx              # Landing page
│   ├── components/               # Landing, dashboard, UI components
│   ├── lib/                      # Auth, email, prisma, stripe configs
│   └── middleware.ts             # Route protection
├── tests/                        # 80+ Playwright E2E tests
└── .env.example                  # All environment variables

Pricing

Standard -- $79

Everything you need to launch an AI-powered SaaS.

Pro -- $119

Standard + priority support and advanced examples.

What you get:

• Complete Next.js 16 source code with TypeScript
• Production-ready Claude AI integration (streaming, rate limiting, input validation)
• 80+ Playwright E2E tests
• NextAuth v5 (Google + GitHub OAuth)
• Stripe integration (checkout, portal, webhooks)
• Prisma 6 + PostgreSQL
• Email via Resend
• All landing pages, dashboard with AI chat, legal pages
• Full documentation and setup guide
• Lifetime updates

30-day money-back guarantee. If LaunchFast does not save you time, get a full refund. No questions asked.

Save $119

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License

MIT License. Use it for unlimited personal and commercial projects.