Updated March 9, 2026
Lovable is a full-stack AI app builder that generates production-ready web applications from natural language descriptions. It handles frontend, backend, database, and authentication, deploying directly to the cloud. Lovable became the fastest-growing European startup in history, reaching $20M ARR in its first two months.
Replit is a browser-based IDE with an AI agent that builds and deploys full-stack applications from natural language prompts. It handles project setup, code generation, package installation, and one-click deployment, making software creation accessible to non-programmers while providing useful automation for developers.
What each tool does well, and the limitations to keep in mind.
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Respan lets you trace LLM and agent calls across any model or framework, A/B test prompts on production traffic, and route requests across 500+ models through one gateway.