FastSvelte

The product is a FastAPI and SvelteKit starter kit that provides authentication, payments, multi-tenancy, and AI usage metering with credit allowances and top-ups to avoid building SaaS infrastructure from scratch. It is for developers and small B2B teams building SaaS products, including startups creating production-ready applications. It is delivered as self-hosted, open-source code with full source access and no platform lock-in, deployable via Docker to any VPS or cloud.

Key features

• Username/password and Google OAuth login
• Email verification and password reset
• Role-based access control
• Argon2 password hashing
• Rate-limited authentication
• Stripe payment processing
• Stripe webhook handling
• Subscription management and billing automation
• Multi-tenant organizations
• Team invitations and permissions
• Admin and user dashboards
• Usage analytics dashboards
• Subscription plan management
• AI credit billing and metering
• Per-plan credit allowances and top-ups
• LLM calls with streaming responses
• SvelteKit SPA with client-side routing
• 3-layer API Service Repository architecture
• Docker containerization
• Transactional email via Resend SendGrid Azure
• SEO-optimized landing page template