Short answer: Greptile is the AI code reviewer that's gone furthest toward actually running something: its TREX beta writes tests and executes them in a sandbox during review. If you're leaving it, the two complaints we hear are the credit model and the first few weeks of noise, and the five tools below handle both. But if you came to Greptile for the execution, be careful what you swap it for, because most alternatives run nothing, and even TREX doesn't run your deployed product.