Generate Entire AI SaaS Codebases From One CLI

What it does

fastapi-fullstack is a project generator — think Cookiecutter with ambition — that produces complete full-stack AI applications. Run the interactive wizard (or use the web configurator) and it emits a codebase pairing a FastAPI backend with a Next.js 15 frontend, complete with Docker, database migrations, and a Makefile. The generated project is meant to be a starting point for AI SaaS products, not a library you import.

The interesting bit

Where most templates pick one stack and call it a day, this generator offers six AI agent frameworks — from PydanticAI to CrewAI — and four vector databases for RAG. It also generates a marketing site, Stripe billing pages, and an admin dashboard, which reveals a specific philosophy: “production-ready” means user-facing features, not just a working /chat endpoint.

Key highlights

• Generated projects include WebSocket streaming chat, JWT/OAuth auth, conversation sharing, and Celery task queues
• Supports six agent frameworks (PydanticAI, PydanticDeep, LangChain, LangGraph, CrewAI, DeepAgents) and four vector stores (Milvus, Qdrant, pgvector, ChromaDB)
• Ships with a browser-based configurator for teams that prefer clicking to CLI flags
• Part of a broader ecosystem including guardrails, subagent orchestration, and sandboxed execution tools

Verdict

Reach for this if you need to prototype an AI SaaS without spending a week on plumbing. If you already have a preferred agent framework and custom design system, the kitchen-sink approach may fight your existing opinions.