SaaS Starter is a production-ready Next.js template that eliminates weeks of boilerplate setup. Auth: Email/password, Google OAuth, Magic links, Email verification (NextAuth v5 + Prisma 7) Payments: Stripe subscriptions, 4 tiers, webhooks, upgrade/downgrade via Billing Portal AI Chat: OpenAI streaming with per-plan message limits (500/2000/∞) MDX Blog + SEO utilities, sitemap, Open Graph shadcn/ui + Tailwind + Framer Motion + Dark mode Resend transactional emails Full docs included