Lovable

Lovable (formerly GPT Engineer) is an AI app builder focused on full-stack web applications with a particular strength in SaaS products. It integrates natively with Supabase for backend/database, Stripe for payments, and GitHub for code export. You describe your product, it builds the frontend and backend, sets up authentication, and connects your database. The code is React/TypeScript with Supabase, making it more structured than Bolt.new's output.

Best for non-technical founders validating SaaS ideas who need working apps with auth, database, and payments — not just UI demos. Product managers can prototype features for user testing without waiting for engineering. The Supabase integration means you get real backend functionality, not just a facade. GitHub export means you can hand it off to engineers when you're ready to scale.

Where it has limits: it's strong within its stack (React + Supabase) and weak outside it. Complex business logic, multi-tenant architectures, or unusual integrations require significant manual work after export. Free tier gives 5 projects and limited messages; paid plans start at $25/month.