# RealDiff

> Runtime behavior diffs for pull requests.

- **Website:** https://github.com/issacnitin/RealDiff
- **Pricing:** paid
- **Categories:** Developer Tools, Design
- **Tags:** developer-tools, design, ai-agents
- **Platforms:** CLI
- **Last verified:** 2026-09-10
- **Canonical page:** https://linkrena.com/tools/realdiff

## About

RealDiff finds runtime behavior changes that ordinary source review misses .

It builds two Git revisions, observes their tests, learns a noise baseline from three base runs, and reports the first changed behavior in each call tree. A source diff tells you what was edited. RealDiff tells you what the edit did, including effects in files the pull request never touched.

List.Sort is not stable; OrderBy is. In the included demo, that one-line infrastructure change alters an unedited pricing engine:

The edited helper is in Infrastructure.Collections ; the observed effect is in Commerce.Pricing . Run the included demo below, or inspect the maintained public .NET demo pull request and its successful hosted run .

Prerequisites for this .NET demo: Git, .NET 8 SDK, and PowerShell 7. Java analysis additionally requires a JDK and the repository's Maven/Gradle wrapper or corresponding system tool; Node analysis requires Node.js and the package manager selected by its lockfile.

The proof creates a temporary proposed-change tree, changes only SortingExtensions.cs , runs the base twice plus the change once, and writes findings.json . It verifies:

## Related tools

- [zeroroot · the zero-trust agent runtime](https://linkrena.com/tools/zeroroot-the-zero-trust-agent-runtime): Gibson Runtime is the substrate your agents execute inside, installed in your own cluster, granted rights they can never exceed, and replayable move by move.
- [Routebase](https://linkrena.com/tools/routebase): The single source of truth for your APIs: design, mock, test, and document APIs from one living spec.
- [Agentconnect](https://linkrena.com/tools/agentconnect): The open-source, multi-agent alternative to Claude Tag.
- [Pr Lens](https://linkrena.com/tools/pr-lens): PR Lens draws every PR as animated architecture and data-flow diagrams, inside the pull request itself.
- [Kit](https://linkrena.com/tools/kit): Kit is a coding agent runtime.
- [Interns Review Plugin](https://linkrena.com/tools/interns-review-plugin): Contribute to alpbahadur/interns-review-plugin development by creating an account on GitHub.