DiffPal: Open-source AI pull request review that runs in your CI

I built DiffPal around a simple idea: if you already have coding agents, you should not have to pay for another per-seat code review SaaS. DiffPal is the reviewer. Codex, Copilot, OpenCode, or any ACP-compatible agent can serve as its review backend. DiffPal provides the stable review workflow around that backend. You stay in control: review configuration and instructions live with the code in Git. What DiffPal does: - Scopes the pull request or merge request diff. - Publishes inline comments and a review summary. - Produces structured JSON findings and SARIF artifacts. - Supports configurable merge gates. - Integrates with GitHub, GitLab, and Azure DevOps. - Provides a ready-to-use GitHub Action, Azure Pipelines task, and GitLab CI integration. You can also cross-review: code written with one agent can be reviewed by DiffPal using a different agent as its backend. There is no mandatory DiffPal cloud or subscription. DiffPal is open source under the MIT License. And yes, DiffPal reviews its own pull requests. Website: https://diffpal.github.io Your chosen agent or provider and CI may have their own costs. Which agent and CI would you use DiffPal with, and what would stop you from trying it on a real pull request?