Compare / Looply vs Greptile
Looply vs Greptile
Greptile and Looply are close in ambition. Greptile builds a graph of your entire codebase and runs a swarm of agents to review each pull request, with runtime validation and independence on its roadmap. Looply's difference is the output and the loop: one auditable verdict judged against your team's own standard, with the change revised until it clears the bar and a human owning the merge.
Side by side
How the two approaches differ.
| Looply | Greptile | |
|---|---|---|
| What you get back | One auditable verdict — safe to merge or not — with the evidence. | Agent-authored review comments on the PR, with full codebase context. |
| Codebase context | Expands context around the change — callers, signals, data flow. | Graph index of the whole repo; a swarm of parallel agents reviews each PR. |
| Running the code | Emphasizes runtime evidence — tests and reproductions in a sandbox. | Offers runtime validation (TREX), in beta at time of writing. |
| Standard & revision | Judged against your team's standard; the agent revises until it clears the bar. | Learns custom context and conventions over time. |
| Maturity | Pre-launch — free for individuals in December 2026. | Generally available, used by thousands of teams. |
Which should you choose?
Honest guidance.
Choose Greptile if
You want a mature, codebase-aware reviewer in production now, with graph-wide context and a growing set of features you can adopt today.
Choose Looply if
You want a single auditable verdict against your own standard rather than a set of comments — with an explicit revise-until-it-clears loop and a human owning every merge.
Greptile details reflect public information as of September 2026 and may have changed. Looply is pre-launch (free for individuals, December 2026). Check each product’s site for the current picture.
FAQ
Common questions
Is Looply a Greptile alternative?
They overlap heavily — both give AI-written code deep, codebase-aware review. Greptile returns agent-authored comments with whole-repo graph context; Looply returns one auditable verdict against your standard and revises the change until it passes.
Both mention independence and running the code — what's actually different?
The framing and the deliverable. Greptile is a mature reviewer with graph-wide context and runtime validation in beta. Looply is built around a single safe-to-merge verdict measured against your team's standard, with the revise loop and human-owned merge as the core of the product.
Which understands a large codebase better?
Greptile is explicit about indexing the entire repository as a graph today. Looply expands context around the change under review. If whole-repo indexing is your priority right now, Greptile is shipping it.
Is Looply available yet?
Not yet — Looply is pre-launch (free for individuals, December 2026). Greptile is generally available today.