The best Python boilerplates for APIs and SaaS products in 2026.
Python boilerplates split mainly along two axes: Django vs FastAPI, and general-purpose vs AI-specific. Which one is "best" depends entirely on what you're building — a subscription SaaS app looks nothing like an LLM-powered API under the hood.
#1FastAPI AI Kit
This kitFastAPI-based, AI-specific: LLM integration, RAG, JWT/API-key auth, and Stripe usage metering pre-wired for AI product APIs.
Pros
- Purpose-built for AI products — not a general scaffold with AI bolted on
- Async-first (FastAPI), which matters for streaming LLM responses
- One-time cost, no recurring license fee
Cons
- API-only — no admin UI or frontend included
- Narrower scope than general SaaS boilerplates if your product isn't AI-centric
Best for: AI/LLM-powered products built in Python that need async performance.
#2SaaS Pegasus
A well-established Django boilerplate for general-purpose SaaS: teams, subscription billing, and a full frontend (Bootstrap/Tailwind) included.
Pros
- Full-featured for general SaaS — teams, invitations, subscription billing
- Frontend templates included, not just an API
- Django's mature ecosystem and admin UI
Cons
- Django is sync-first; streaming LLM responses require extra care
- Not AI-specific — no LLM, RAG, or token-metering features built in
Best for: General-purpose subscription SaaS products not centered on an AI feature.
#3Full Stack FastAPI Template
Free, community-trusted, general-purpose FastAPI + React template with Postgres and Docker Compose.
Pros
- Free and actively maintained
- Solid general project structure
Cons
- No AI-specific features
- No billing/metering system included
Best for: Free general-purpose starting point for non-AI Python APIs.
Our take
Django-based boilerplates like SaaS Pegasus win for general subscription SaaS products that need a full frontend and team management out of the box. FastAPI-based options win when async performance and AI-specific infrastructure (LLM calls, RAG, streaming) are core to the product.
If FastAPI AI Kit fits your use case
The production-ready FastAPI + AI boilerplate and starter kit. Skip 60+ hours of setup. JWT auth, LLM integration, RAG pipeline, billing hooks, Docker — ready to deploy.
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