A ready-made starting point for building a web app with a built-in AI chat feature.

• Includes a working demo to explore
• Handles common setup tasks for you
• Uses popular tools that scale well

Explore it here: https://t.co/apBOfpKY5q https://t.co/IaWnJZ5s4r

Fullstack SaaS boilerplate with Fastify, tRPC, and React 19—demo included

Source: https://www.opensourceprojects.dev/post/ai-fullstack-saas-boilerplate

Stop Building SaaS Auth and Payments From Scratch Every Time

You’ve got a great SaaS idea, but let’s be honest—the last thing you want to do is spend your first month wiring up authentication, database schemas, and API routes. That’s the unglamorous plumbing that every web app needs but nobody wants to rebuild. The good news? Someone already built it for you. TheFullstack SaaS Boilerplateis an open-source starting point that bundles a modern, type-safe stack into one cohesive project, so you can skip the scaffolding and get straight to your actual product.

What It Does

This is a full-stack boilerplate designed specifically for SaaS applications, and it’s built on a stack that prioritizes developer experience and end-to-end type safety. The frontend runs onReact 19withTailwind CSS v4for styling, while the backend is powered byFastify, a web framework known for its performance and low overhead. To connect the two, it usestRPC, which gives you fully typesafe APIs without needing a separate code generation step—your types flow automatically from the server to the client.

On the data side, the boilerplate usesDrizzle ORMwithPostgres, giving you a TypeScript-first approach to database management. The README also mentions a live demo hosted on Render’s free tier, complete with a chat feature (you can see it in action via a video preview in the repo). It’s worth noting that the demo runs on a free instance, so it may spin down during inactivity—if you click it and it’s slow, that’s why. Just give it a minute to wake up.

Why It’s Cool

This project makes some deliberate stack choices that are worth paying attention to:

• **tRPC instead of REST or GraphQL.**If you’re tired of maintaining separate API contracts and manually syncing types between client and server, tRPC is a breath of fresh air. You write a function on the server, and it’s instantly callable from the client with full autocomplete and type checking. No codegen, no schema duplication. It just works.
• **Fastify over Express.**While Express is the default for many Node developers, Fastify offers better performance out of the box and a more modern plugin architecture. If you care about request throughput—and for a SaaS, you should—this is a solid foundation.
• **React 19 and Tailwind v4.**These are the latest versions of their respective tools, so you’re not starting with yesterday’s tech. Tailwind v4, in particular, brings some significant performance and configuration improvements over earlier versions.
• **A working demo with chat.**A boilerplate is only useful if it actually runs, and the fact that there’s a live, hosted demo means you can poke around the UI before you even clone the repo. Seeing the chat feature in action gives you a concrete sense of what the final product feels like.
• **The “AI” in the name.**While the README doesn’t detail specific AI features, the project title suggests it’s designed to be a foundation for AI-powered SaaS apps. The chat demo hints at where this could go—think AI chatbots or agents built on top of this architecture.

How to Try It

Getting started is straightforward. Head over to theGitHub repositoryand check it out.

1. Clone the repository: git clone https://github.com/alan345/ai-fullstack-saas-boilerplate.git cd ai-fullstack-saas-boilerplate
2. **Explore the demo first.**Before you run anything locally, click the demo link in the README to see the deployed version. It’s hosted on Render’s free tier, so if it’s slow to respond, just wait—it’ll boot up after a cold start.
3. **Read the documentation.**The README is your friend here. It lists the main stack and points you to the relevant docs for each technology (Drizzle, Fastify, tRPC, etc.) in case you need to brush up on any of them.
4. **Set up your environment.**You’ll need a Postgres database and Node.js installed. The repo should have configuration files and environment variable templates to get you going—check the README or the project structure for specifics.
5. **Run it locally.**Once your environment is configured, install dependencies and start the dev server. You should have a working full-stack app running in minutes.

Final Thoughts

This boilerplate is best suited for developers who want to move fast and don’t want to compromise on type safety or performance. If you’re building a SaaS product and you’re comfortable with (or excited to learn) the TypeScript ecosystem, this gives you a solid, opinionated foundation that’s already wired together. The stack is modern, the demo is functional, and the typesafe architecture will save you from a whole class of bugs down the line. It’s not a magic bullet—you’ll still need to build your actual product—but it’s a genuinely useful head start.

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