Open-source AI code review tools (2026)
AI code review tools with public source code you can read, self-host and extend. Here are all 16 from the AgentScout directory.
Quick answer: the top picks on this list, ranked by GitHub stars and listing maturity, are Open Code Review, GitHub MCP Server and Open SWE, out of 16 tools listed below. At a glance: 16 open-source, 16 free or freemium and 16 local or self-hosted across 16 link-checked tools (last verified ).
Verified on : every tool link on this page was checked by our daily link check. No paid placements.
Ranked comparison (top 10)
| # | Tool | Pricing | Best for | Open source | Runs locally | GitHub stars |
|---|---|---|---|---|---|---|
| 1 |  Open Code Review | Open source | write code | Yes | Self-hosted | 48,455 |
| 2 |  GitHub MCP Server | Open source | write code, connect tools via MCP | Yes | Self-hosted | 33,998 |
| 3 |  Open SWE | Open source | write code, run code safely | Yes | Self-hosted | 11,123 |
| 4 |  Emdash | Open source | write code | Yes | Self-hosted | 6,096 |
| 5 |  Redamon | Open source + cloud | write code, build an agent | Yes | Self-hosted | 3,231 |
| 6 |  Shippie | Open source | write code | Yes | Self-hosted | 2,513 |
| 7 |  PR Lens | Open source | write code, make diagrams | Yes | Offline | 2,257 |
| 8 |  Kodus | Open source + cloud | write code | Yes | Self-hosted | 1,531 |
| 9 |  Superlog | Open source + cloud | monitor & evaluate agents, automate workflows | Yes | Self-hosted | 1,475 |
| 10 |  Tracely | Open source + cloud | monitor & evaluate agents | Yes | Self-hosted | 1,196 |
Updated
How we picked and ranked: tools are matched by category, the pricing each maker states and what each tool says it does. They are ranked by GitHub stars as recorded on each listing (link checks 2026-10-28); tools without a tracked repo follow, by listing maturity. No paid placements.
1. Open Code Review
Alibaba's AI code review CLI that combines deterministic pipelines with an LLM agent to post line-level comments on Git diffs, using OpenAI or Anthropic models.
Pricing (as stated): Open source · Mature
2. GitHub MCP Server
GitHub's official MCP server for letting agents work with repositories, issues, pull requests and Actions.
Pricing (as stated): Open source · Mature
3. Open SWE
LangChain's asynchronous coding agent that takes work from GitHub issues, Slack or Linear, implements it in an isolated sandbox and opens a pull request.
Pricing (as stated): Open source · Mature
4. Emdash
A free, open-source agentic development environment (YC W26) for running Claude Code, Codex and other coding agents in parallel, each in its own worktree, then reviewing diffs, PRs and CI in one place.
Pricing (as stated): Free and open source (Apache-2.0). · Mature
5. Redamon
Open-source, self-hosted AI penetration testing framework: maps your attack surface into a graph, autonomously exploits it from a Kali sandbox with human approval gates, and opens PRs that fix what.
Pricing (as stated): Open source + cloud · Active
6. Shippie
Extendable code review and QA agent that reads your diff, explores the codebase and posts focused review comments.
Pricing (as stated): Open source · Active
7. PR Lens
PR Lens helps people review code that agents wrote. For each pull request it draws animated architecture and data-flow diagrams inside the PR, showing which parts of the app were added, changed or removed, what else depends on the change and how a request now moves through the system. It also flags likely bugs, security holes and design problems in the same review comment, with a ready prompt to hand each fix to your coding agent or an autofix. The open-source core runs locally and installs as an agent skill.
Pricing (as stated): Open-source core (MIT), runs locally; installs as an agent skill · Active
8. Kodus
Self-hostable AI code reviewer for GitHub, GitLab, Bitbucket and Azure DevOps pull requests that works with the model you choose.
Pricing (as stated): Open source + cloud · Active
9. Superlog
Superlog runs AI agents on routine engineering work around production. You set up automations with triggers and connectors, for example rating each new Sentry issue, posting a plain-language summary to Slack and opening a pull request with the fix, comparing error rates and latency against their normal range every hour, adding missing logs and spans to hard-to-debug code paths, or answering community questions from your code and docs. You choose the model and agent harness and bring your own tokens or subscriptions. The core is open source (Apache-2.0) with a hosted version.
Pricing (as stated): Open source (Apache-2.0) to self-host; hosted plans and enterprise on the pricing page; bring your own model tokens or subscriptions · Active
10. Tracely
Tracely is open-source, trace-native CI/CD for AI agents: it grades every production trace with evaluators, clusters failures into issues, freezes bad runs into replayable test cases and blocks pull requests that would reintroduce them.
Pricing (as stated): Self-host free (MIT); hosted Free $0 (20k traces/month), Team $49/mo; LLM judges run on your own OpenRouter key · Active
11. OpenQodex
Code review that runs inside your coding agent before you push, combining security and quality scanners with a separate AI reviewer.
Pricing (as stated): Open source · Active
12. Aletheore
Aletheore audits code repositories and backs every finding with evidence. Its deterministic scanner looks for leaked secrets, vulnerable dependencies and dead code, it can watch live endpoints and draw architecture maps, and it reviews pull requests automatically through a GitHub Action. A built-in MCP server lets coding agents run the same audits.
Pricing (as stated): Open source + cloud · Active
13. CodeAF
CodeAF is an open-source software factory from AgentField built to run on open models. It ships ready-made specialist agents you call with slash commands, one to build features like a senior developer, one to audit code for security issues and one to review GitHub pull requests, and spreads the work across a pool of models to balance cost and quality.
Pricing (as stated): Open source · Active
14. Muxin
Muxin is a free, open-source desktop app that puts all your Macs, Linux, Windows and cloud machines in one window, so you can run Claude Code, Codex and other agent CLIs on any of them, see their screens and logs, and take changes to a pull request.
Pricing (as stated): Free and open source (Apache-2.0) · Active
15. Orbi
Orbi is an open-source (AGPL-3.0) software factory for GitHub repositories. When you label a GitHub Issue ai-ready, Orbi implements it in an isolated worktree, opens and reviews pull requests in a separate AI review session that checks acceptance criteria and repairs failing tests, merges the exact reviewed commit SHA, and cuts a tagged GitHub Release when a human applies the ai-release label.
Pricing (as stated): Self-hosted: free and open source (AGPL-3.0 or Sustainable Use License, bring your own model); Cloud: 3 free merged deliveries (no card), Solo $24/month (400M tokens, 1 repo), Pro $66/month (1.2B tokens, 5 repos) · Active
16. Diffinery
Open source, agent-first GitHub alternative on your own Cloudflare account: git hosting, pull requests, Actions-compatible CI, and agents with their own accounts.
Pricing (as stated): Apache-2.0, free to self-host on your own Cloudflare account; hosted early access · Active
FAQ
What are the best open-source AI code review tools?
Ranked by tracked GitHub stars, the top open-source AI code review tools in our directory are Open Code Review, GitHub MCP Server, Open SWE, Emdash, Redamon. Stars measure popularity, not fit, so compare a few against your own task.
How many open-source AI code review tools does AgentScout list?
16 tools match. This page shows the top 16. Pricing mix on this page: Open source (10), Open source + cloud (6).
How much do these tools cost?
Pricing is what each maker states on their site. Open-source tools are free to self-host but may need a paid model API key or offer paid cloud plans; freemium tools have a free plan with limits. Check each official site.
Where can I see every tool for reviewing pull requests?
Our task page lists all 30 tools we match to reviewing pull requests.
Related: All tools for reviewing pull requests · coding (10) · MCP servers (2) · evals & observability (2) · QA & testing (1)
By role: For developers · For QA engineers
All popular searches · AI agents by role · Free tools
Best-of lists: Cursor alternatives · All best lists
Related categories: Coding
Facts come from our directory listings; pricing is as each maker states it and can change. Check official sites before you choose.