Bolt.new.

In their words

• Inside Bolt: From near-death to ~$40m ARR in 5 months—one of the fastest-growing products in history Eric Simons is founder and CEO of StackBlitz, the company behind Bolt, a web-based AI coding agent. After nearly shutting down, the team launched Bolt on Twitter and reached nearly $40M ARR in about five months with only 15 to 20 people. Simons credits years of deep technology work, very low burn and surviving until the market caught up.