Greptile is an AI-powered code review platform that acts as a centralized validation layer for pull requests. It builds a graph index of the codebase — mapping files, functions, and dependencies — then deploys a swarm of agents to review PRs with full codebase context, catching bugs, security vulnerabilities, and logic errors beyond the diff. Used by over 22,000 teams, Greptile integrates with GitHub and GitLab, supports self-hosted and cloud deployments, and continuously learns from engineers' PR comments to adapt to team standards.