Pythagora

Pythagora (YC W24, $4M seed) is built around GPT Pilot, an open-source AI developer with 28k+ GitHub stars. Instead of autocomplete, you describe the app you want; Pilot asks clarifying questions, writes the product and technical specs, then codes the app step by step — setting up the environment, writing features, debugging, and committing — while you review each task and unblock it when it gets stuck. It handles roughly 95% of the coding work with the developer as reviewer, ships as a VS Code extension, and supports OpenAI, Anthropic, and Groq models.

The honest picture: it excels at greenfield CRUD-style apps and struggles with complex architectures, novel integrations, or anything requiring deep domain judgment. Builds take real supervision time — the review loop is the product. The core is open source, but the polished hosted experience is where the company monetizes.

Install the Pythagora VS Code extension from the marketplace, add an LLM API key in settings, and describe the app you want to build.