FastSvelte
FastSvelte is a SaaS starter kit that combines FastAPI and SvelteKit to provide a ready-to-use foundation for building web-based software-as-a-service products. It includes essential infrastructure such as user authentication, subscription billing with Stripe, multi-tenant organization support, and role-based access control, allowing developers to bypass months of boilerplate setup. The kit comes with built-in AI integration features, including AI credit metering and billing. It provides a working sample AI application with LLM calls, streaming responses, and usage tracking, enabling AI-powered SaaS products to easily manage token-based credit allowances, subscriptions, and pay-as-you-go top-ups. Additional features include admin and user dashboards, a conversion-focused landing page template, transactional email support (Resend, SendGrid, or Azure), and a clean three-layer architecture following the API → Service → Repository pattern with dependency injection. The entire stack is Dockerized for deployment on any infrastructure. FastSvelte leverages modern technologies: FastAPI for the backend, SvelteKit for a high-performance single-page application frontend, PostgreSQL for data storage, Tailwind CSS and DaisyUI for styling, and TypeScript for type safety. It targets developers and startups looking to launch their SaaS rapidly without reinventing common patterns.
- Category
- Productivity
- Pricing
- Paid
Problem solved
Eliminates months of repetitive setup for SaaS applications by providing a comprehensive, production-ready starter kit with authentication, billing, multi-tenancy, and AI capabilities out of the box.
Use cases
- Launch a B2B SaaS platform with multi-tenancy and team management
- Add AI features with token-based credit billing and consumption tracking
- Rapidly prototype and deploy a subscription-based web application
- Set up an admin dashboard with analytics and user management
- Deploy a Dockerized application to any cloud or VPS
Audience
- Developers
- Startups
Pros
- Comprehensive out-of-the-box SaaS infrastructure
- Modern, powerful stack (FastAPI, SvelteKit)
- Integrated AI credit billing and usage tracking
- Clean layered architecture with dependency injection
- Docker-ready for easy deployment anywhere
Cons
- Paid starter kit (not free)
- Requires familiarity with FastAPI and SvelteKit
- Opinionated structure may not suit all project needs
- Limited to PostgreSQL and Stripe
- No mentioned community or support
Official website: https://fastsvelte.dev/
Canonical LambdaBase page: https://www.lambdabase.com/tools/fastsvelte