Greptile

Greptile is a codebase-aware AI code reviewer that indexes the whole repository to reason about how pull-request changes affect the rest of the code. It scores highly on bug-catch rate in independent tests, with more false positives than quieter rivals. Founded out of YC W2024 and backed by Benchmark, it uses a free tier plus usage-based per-review pricing introduced in 2026.

Greptile is an AI code reviewer built around deep codebase understanding: rather than reviewing a diff in isolation, it indexes the whole repository to reason about how changes interact with the rest of the code. In independent comparisons it has scored notably high on bug-catch rate, at the cost of more false positives than some quieter competitors, reflecting a deliberate tilt toward finding real issues. Founded by Georgia Tech graduates and part of Y Combinator's W2024 cohort, Greptile raised a Series A from Benchmark. In 2026 it shifted to a usage-based pricing model, billing per review beyond a free monthly allowance, and later launched a general free tier with 50 reviews per month for unlimited authors. The per-review model drew some developer pushback as an unusual choice in a category that mostly charges per seat. Greptile suits teams that prioritize catching subtle, cross-file bugs and are willing to triage more flagged items to get them. Teams that want the lowest-noise experience may prefer alternatives, but for aggressive detection with whole-repo context, Greptile is a strong option.