AI SaaS Starter Kit

A Next.js + FastAPI monorepo for shipping AI image-generation SaaS products

AI SaaS Starter KitCheck AI SaaS Starter Kit

Best for: Teams building an AI image-generation SaaS who want auth, billing, and file storage pre-wired across a Next.js frontend and FastAPI backend.
Skip if: You don't want a two-language (TS + Python) monorepo, or you need a different AI provider than NVIDIA NIM out of the box.

AI SaaS Starter Kit by Backblaze Labs pairs a Next.js 16/React 19 frontend with a Python FastAPI backend in one pnpm monorepo. It bundles Supabase auth, Stripe subscription billing, NVIDIA NIM-powered text-to-image generation, and Backblaze B2 file storage with an admin console for users, jobs, and files.

Pros

Full-stack: Next.js frontend and FastAPI backend both included, not just one side
Stripe billing with Free/Pro/Team plans and a customer portal already built
AI image generation pipeline wired end-to-end with Backblaze B2 storage
Structured for AI coding agents with AGENTS.md and architecture docs

Cons

Backed by Backblaze, so storage is opinionated toward B2 rather than S3/R2
Two-language monorepo (TypeScript + Python) raises the setup bar
Image generation tied to NVIDIA NIM/Genblaze SDK, less flexible if you want another model provider