Lovable (formerly GPT Engineer) enables natural language app development—describe your idea and get a working full-stack application. Agent Mode handles complex requirements with autonomous debugging and real-time web search. Built-in Supabase integration provides database, authentication, and API setup automatically. Multi-LLM support includes OpenAI, Claude, and Gemini (Gemini 3 Flash default). Conversational and visual editing let you refine UI through chat. Full code ownership with GitHub sync enables further customization. AI features include chatbots, sentiment detection, document Q&A, and multilingual translation. Free plan provides 5 daily credits for public projects. Starter ($20/mo) adds 100 credits and private projects. Launch ($42/mo) includes 250 credits and custom domains.