Greptile
Codebase Q&A engine. Indexes your full GitHub repo and answers complex questions ("Where is authentication handled?", "Which file manages payment errors?"). Understands cross-file dependencies that grep searches miss. Alternative to manually reading a large codebase.
Strengths
- Natural language Q&A on the full codebase, understands cross-file dependencies
- Accelerated onboarding: contextual answers in minutes rather than hours of reading
- Full GitHub repo indexing, holistic view impossible with local grep
Limitations
- Free plan limited to 1 public repo, private repos require a subscription
- Redundant with Claude Code filesystem reading capabilities on local repos
- Moderate confidence score, real experience to validate on your specific stack
Best for
- Onboarding to an unknown 100k+ LOC codebase, fast mapping without exhaustive reading
- Architectural questions on codebases where dependencies are hard to trace
- Teams with poorly documented legacy codebases looking to understand existing code