Builder.ai, once considered one of the most promising startups in the AI world, has filed for bankruptcy.The company had raised over $450 million, including funding from Microsoft and Softbank, but is now shutting down.Builder.ai started in 2016 with the idea of making software development easier for non-coders by using AI to guide them through building custom apps.Despite its initial promise, the company's journey led to its eventual downfall and bankruptcy in May 2025.