Robin

About Robin

Robin is free AI code review for every pull request. You bring an API key; Robin posts reviews in your GitHub repo like a teammate left comments — no SaaS account, no per-seat pricing, no vendor lock-in.

Written and maintained by Anton Gulin (GitHub @antongulin), an independent developer who builds practical tools for other developers. Last updated: July 18, 2026.

Why Robin exists

AI code review works. The problem is how it's usually sold: a third-party SaaS bot you sign up for, that charges per seat, runs on quotas, and routes your private diffs through someone else's servers. For an open-source maintainer or a small team, that's a hard trade — you want the second pair of eyes on every PR, but not the bill, the lock-in, or the data-handling questions.

Robin removes the trade-off. It's a reusable GitHub Actions workflow that lives in your own repository and calls an LLM with your own API key (BYOK). You can point it at OpenRouter's free models and run real AI review at $0, or at OpenAI, Groq, or a self-hosted Ollama server if you'd rather. The code is MIT-licensed, so nothing about it is a black box. It started as a practical answer to a simple question: why should automated review feedback require a subscription?

Who builds it

Robin is built and maintained by Anton Gulin, an independent developer who builds practical tools for other developers. He created Robin after wanting honest, automated review feedback on his own projects without onboarding yet another SaaS service — and decided the useful version of that should be free and open for everyone. He maintains the project, the reusable review workflow, and the install script in the open on GitHub, where issues and contributions are welcome.

How it works

A reusable GitHub Actions workflow fetches the pull request diff, calls your configured LLM provider, and posts structured findings with High / Medium / Suggestion severity tiers directly on the diff. Reviews run once when a PR opens; you can push more commits without triggering another pass, and re-review on demand by commenting /robin. Setup is three GitHub Secrets — LLM_API_KEY, LLM_BASE_URL, and LLM_MODEL — plus one workflow file. Because everything runs inside your repository's own runner, your source never touches a Robin server.

Who it's for

  • Open-source maintainers who want consistent review on community PRs without a per-contributor bill.
  • Solo developers and small teams who want a second reviewer but can't justify a paid seat.
  • Privacy-conscious teams that need the diff to stay between their CI and an LLM endpoint they control.

Open source

Robin is MIT-licensed. Source, issues, and contributions live on GitHub. Advanced configuration, self-hosted runners, and troubleshooting are documented in the repo.

Support the project

Contact

Questions, feedback, or partnership: info@robinreview.dev