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Paul Graham tweets about Greptile, a YC company that faced a revenue decline crisis in late 2024 but has since recovered, noting the company's name as one of his favorites.
Greptile introduces TREX, an AI code reviewer that executes code and detects runtime bugs, going beyond static analysis by spinning up parallel agents to investigate issues and generate artifacts like screenshots.
Greptile launches T-Rex, a feature that runs your branch in a sandbox to find bugs by mocking API calls, clicking around the UI, and running unit tests, catching ~20% more bugs than base Greptile.