Greptile is an AI code review agent that builds a graph index of your entire codebase, then runs a swarm of LLM agents over every pull request to flag bugs, regressions and broken assumptions. We rate it 78/100 — a strong, deep reviewer for teams that ship complex multi-service codebases, but pricey at $30 per developer per month and historically noisy until the v4 release in early 2026.

What is Greptile?

Greptile was founded in 2023 by three Georgia Tech students — Soohoon Choi, Daksh Gupta and Vaishant Kameswaran — who pivoted out of an AI shopping assistant idea inside Georgia Tech's CREATE-X program. The company joined Y Combinator's Winter 2024 batch and later raised a $25 million Series A led by Benchmark, taking total funding to about $30 million at a reported $180 million valuation.

Where most AI reviewers read only the diff, Greptile constructs a codebase graph mapping how functions, classes and modules relate, and uses that context when reviewing a PR. That is the entire pitch: catch the bug in module A that quietly breaks an assumption in module B three folders away — the class of issue that fast diff-only reviewers miss. Greptile says it now reviews 5–8 million lines of code per week for customers including Brex, Whoop, Substack, Mintlify, WorkOS and Bland.

Greptile AI code review agent commenting inline on a GitHub pull request — Greptile leaves inline comments on a GitHub pull request after indexing the full repository.

Key Features of Greptile

Full-codebase graph indexing: Greptile constructs a dependency graph across your whole repo — not just the diff — so it can flag breakages in code the PR does not touch.
Agent swarm review: Multiple specialised agents inspect each PR for correctness, security, style and architectural drift, then collapse their findings into a single review.
GitHub, GitLab and GHE support: Installs as a GitHub App, a GitLab integration via group token + webhook, and supports GitHub Enterprise Server for self-hosted teams.
Custom rules and Learning: Teams can write repo-specific rules, and Greptile reinforces from 👍/👎 reactions on its comments to suppress noisy patterns over time.
12-language first-class support: Python, JavaScript, TypeScript, Go, Java, C, C++, C#, Swift, PHP, Rust and Elixir are fully supported; other languages work with reduced quality.
Greptile MCP and "Fix in X": The v4 release added an MCP server, a Claude Code plugin and one-click "Fix in Cursor / Claude Code" handoffs from any review comment.
Public API: Programmatic access lets teams trigger reviews, query the codebase index and pipe results into custom workflows.

Greptile custom rules editor with team-specific code review guidelines — Custom rules let teams encode repo-specific conventions Greptile must enforce on every PR.

What Users Say About Greptile

Sentiment is mixed but trending up. Independent benchmarks consistently put Greptile first on bug catch rate at 82% versus CodeRabbit's 44% — but also last on false positives, with one widely-cited test flagging 11 false positives to CodeRabbit's 2. The most upvoted Reddit thread we found summarises it bluntly: "Greptile might catch more bugs, but at what cost? High false positives, slow reviews."

Praise centres on the cross-file insights — "no other tool matches Greptile's depth" on schema migrations and module-boundary breakage. Complaints centre on noise volume forcing teams to learn to ignore the bot. Greptile's own v4 post-mortem acknowledges this directly and reports the comment-addressed rate jumped from 30% to 43% after v4 shipped, with a 74% increase in addressed comments per PR and a 68% bump in positive replies.

Greptile learning system suppressing noisy comments based on team feedback — Greptile's Learning system uses 👍/👎 feedback on comments to reduce false positives over time.

Greptile Pricing

Greptile is paid-only — there is no free personal tier as of April 30, 2026. Public open-source projects can apply for free usage, and self-hosted / enterprise pricing is available on request.

Plan	Price	Key Limits
Free Trial	14 days	Full Pro features, no card up front
Pro	$30 / developer / month	Unlimited reviews, GitHub + GitLab, custom rules, Learning
Open Source	$0	Free for qualifying public OSS repos
Enterprise / Self-Hosted	Custom	SSO, on-prem deployment, audit logs, priority support

Who Should Use Greptile?

Best for: mid-size to large engineering teams (15+ developers) shipping into a complex, interconnected codebase — backends with shared schemas, microservice graphs, infra-heavy SaaS — where the cost of a missed cross-file regression dwarfs $30/seat.

Not ideal for: two-person startups, hobby projects and teams that already feel review-fatigued. The lack of a free hobby tier rules out solo developers, and the historically high comment volume punishes teams that won't invest in tuning custom rules.

Pros and Cons

Pros:

Industry-leading 82% bug catch rate in independent benchmarks — clearly best-in-class on hard, cross-file bugs.
Genuine codebase context: indexes the whole repo, not just the diff.
v4 (early 2026) materially reduced false positives — addressed-comment rate rose from 30% to 43%.
First-class GitHub, GitLab and GitHub Enterprise Server support, plus a public API and MCP server.
Production references including Brex, Whoop and Substack signal the depth scales.

Cons:

$30/seat with no free hobby tier prices small teams out.
Even after v4, noise is higher than CodeRabbit and Cursor Bugbot in head-to-head tests.
Reviews can feel slow versus diff-only competitors because the graph is consulted on every PR.
No Bitbucket support as of this writing.

Alternatives to Greptile

Greptile's main rivals are CodeRabbit (cheaper, lower noise, less codebase depth), Cursor Bugbot (tighter integration with the Cursor editor but shallower analysis) and Graphite Reviewer (better stack-of-PRs workflow, weaker on cross-file bugs). For self-hostable, open-source alternatives, look at Aider's review modes or pair with Cline in your editor.

Verdict: Is Greptile Worth It?

If your team ships into a real codebase — not a 5-file SaaS dashboard — and you have the engineering discipline to tune custom rules and read the comments, Greptile is the deepest AI reviewer on the market in 2026. The 82% bug catch rate is not marketing fluff; the v4 release closed most of the noise gap; and the customer list speaks to durability. If you are a two-person team or you want a free hobby tier, look at CodeRabbit or wait for Greptile to ship a free plan. We rate Greptile 78/100: very good, with the rough edges still warranting honest disclosure.

Frequently Asked Questions

Is Greptile free?: No. Greptile costs $30 per developer per month with a 14-day free trial. Public open-source projects can apply for free usage, but there is no free hobby tier for private repos.
What platforms does Greptile support?: Greptile is a web service that integrates with GitHub, GitLab and GitHub Enterprise Server. It also offers a public API, an MCP server, a Claude Code plugin and one-click handoffs to Cursor.
How does Greptile compare to CodeRabbit?: Greptile catches more bugs (82% vs 44% in independent tests) thanks to full-codebase indexing, but generates more false positives. CodeRabbit is cheaper and quieter; Greptile is deeper.
Is Greptile open source?: No. Greptile is a closed-source commercial product, though qualifying open-source repositories can use it for free.
What languages does Greptile support?: First-class support for Python, JavaScript, TypeScript, Go, Java, C, C++, C#, Swift, PHP, Rust and Elixir. Other languages work but with reduced review quality.
Who uses Greptile?: Reported customers include Brex, Whoop, Substack, Mintlify, WorkOS and Bland. Greptile says it reviews 5–8 million lines of code per week across its customer base.

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