I Got Tired of Rebuilding Auth, Billing, and AI Features for Every SaaS (opens in new tab)

Every time I start a new SaaS product, I hit the same wall. The idea's different. The landing page's different. The AI feature's different. But the foundation is almost always identical: auth, a user dashboard, Stripe subscriptions, protected routes, database models, a pricing page, checkout, webhooks, a billing portal, the AI integration itself, usage limits, error handling, a bit of admin tooling, and deployment. And before I can touch the thing I actually set out to build, I've burned days...