What does an AI code review tool do?

It reads a pull request. It comments on likely bugs, security issues, and quality problems, often with fixes. So a reviewer sees a first pass before spending human time. Most post right on the PR. Some also review in the IDE or CLI.

Are any AI code review tools open source?

PR-Agent, by Qodo, is MIT-licensed. You can self-host it. Most others here are hosted SaaS. Several do offer a self-hosted option in your own cloud.

Top AI Code Review Tools (2026)

AI code review tools read a pull request and comment on bugs, security, and quality before a human does. Some are hosted bots that post on every PR. Others are open-source agents you self-host. This list covers the tools teams reach for, with durable facts only.

1
CodeRabbit
A hosted AI bot that reviews pull requests. It posts reviews and summaries on each PR. It can also review in the IDE and the CLI. Tagline: "Cut code review time & bugs in half, instantly."
Model:
Hosted SaaS
Runs:
PR (GitHub/GitLab/Azure/Bitbucket) + IDE + CLI
2
Greptile
AI agents that review pull requests. For context they use a graph index of the whole codebase. Cloud SaaS, with a self-hosted AWS option for enterprise.
Model:
Hosted SaaS (enterprise self-host in AWS)
Runs:
PR review
3
Graphite
A cloud AI reviewer for GitHub pull requests. It flags bugs, security holes, and quality issues. It is part of Graphite's stacked-PR platform.
Model:
Hosted SaaS
Runs:
GitHub PR (cloud)
4
Qodo Merge
An AI review and governance layer, formerly Codium. It reviews pull requests and suggests fixes. It works across git platforms and IDEs.
Model:
Hosted SaaS
Runs:
PR (GitHub/GitLab/Bitbucket/Azure) + IDE
5
PR-Agent
An open-source (MIT) pull-request agent from Qodo. It has /describe, /review, /improve, and /ask commands. It works with any model via LiteLLM. You can self-host it.
License:
MIT
Runs:
CLI / GitHub Actions / Docker / webhooks
6
Sourcery
A hosted AI review that runs on every pull request. It gives feedback in the IDE and scans for security issues.
Model:
Hosted SaaS
Runs:
PR (GitHub/GitLab) + IDE
7
Korbit
A hosted AI reviewer. It finds issues and writes pull-request notes before a human looks. It works across the major git hosts.
Model:
Hosted SaaS
Runs:
PR (GitHub/GitLab/Bitbucket)
8
Ellipsis
A cloud platform for governed coding agents. One use case is auto PR review. Its config lives as YAML in the repo. There is an AWS self-host option.
Model:
Hosted SaaS (self-host in your AWS VPC)
Runs:
Review + agents (GitHub/CLI/API/Slack/Linear)

Reviewed quarterly. Durable facts only: what it is, license, where it runs. Stars, pricing, and benchmark scores are left off. They rot too fast to stay right on a static page. Each row carries the date it was last checked against the source.

Common questions

What does an AI code review tool do?: It reads a pull request. It comments on likely bugs, security issues, and quality problems, often with fixes. So a reviewer sees a first pass before spending human time. Most post right on the PR. Some also review in the IDE or CLI.
Are any AI code review tools open source?: PR-Agent, by Qodo, is MIT-licensed. You can self-host it. Most others here are hosted SaaS. Several do offer a self-hosted option in your own cloud.