How Modal Powered 250,000 Lovable App Creations in a Weekend

Lovable used Modal Sandboxes to run LLM-generated code during a June 2025 promotional weekend with Anthropic, OpenAI, and Google, enabling users to build an estimated 250,000 applications in 48 hours. Modal ran over 1 million sandboxes with up to 20,000 concurrent at peak as Lovable's concurrent sessions surged 2.5-3x, and its platform team was not paged once. Lovable cut its sandbox orchestration code from 15,000 lines to 700 lines after switching to Modal.