Co.dev takes a plain-language description, something like a SaaS dashboard with user login and Stripe billing, and generates a working Next.js and Supabase application, with Prisma handling the database layer. It supports GPT-4.1, Claude 4, and Gemini 2.5 Pro as underlying models, giving some flexibility in which one actually does the generation.
Generated applications come with automatic package setup, domain provisioning, and SSL configuration, and critically, the full source code is downloadable or connectable to GitHub, which means there's no lock-in the way there can be with platforms that only let an app run on their own infrastructure. One-click deployment to a custom domain rounds out the workflow from idea to a live, reachable app.
Being Y Combinator-backed gives it some credibility and funding runway in a crowded field of AI app builders, where the main differentiators tend to be exactly this kind of lock-in-free code ownership rather than fundamentally different generation capability.