Diffity

Diffity is a free open source Mac app to review code changes and send comments to Claude Code or Codex.

Diffity is a free, open-source Mac application designed to review code changes like a pull request. Users can review local code, agent work, or GitHub pull requests, comment on specific lines, and send feedback to Claude Code or Codex for automatic fixes. The app supports tagging agents like @claude or @codex in comments for direct answers and thread replies. It includes a Files tab to comment on any file, a model selection menu to pick agents and models, and integration with GitHub to submit reviews and view GitHub comments. Users can open projects from the terminal or via command line installation, and review any commit, range, or branch.

Diffity at a glance

Best for: Software engineer
Runs on: macOS, CLI
Pricing: Free and open source
Released: October 2026
Category: AI coding tool
Website: diffity.com

Key features

Review code changes like a pull request
Comment on any line, file, or whole change
Send comments to Claude Code or Codex for fixes
Mention agents in comments for direct answers
Get automated reviews from installed agents
Review pull requests checked out locally
Submit reviews and sync comments with GitHub
Open projects from the terminal command line

Use it for

Reviewing local code changes and git commits
Reviewing work generated by AI coding agents
Reviewing and commenting on GitHub pull requests
Asking Claude Code or Codex to fix code issues

Companions

Tools that articles about Diffity recommend using with it, each with its job.

Claude Code — Built to work with Claude Code.
Codex — Built to work with Codex.
Context7 — Provides up-to-date documentation for AI agents and code editors.
Superpowers — Brainstorm, plan and execute skills for bigger tasks.
Playwright MCP — Enables LLMs to interact with web pages using structured accessibility snapshots.
GitHub MCP Server — Reads pull requests, issues and code search on GitHub.

Alternatives to Diffity

jevgrep — Reduces coding agent costs by providing targeted, relevant repository context.
Diffle — Review git diffs in the browser and send comments to GitHub or agents.
Diffblue — Generates verified, production-ready unit tests across entire repositories.
Bloblings — Tracks multiple coding agent sessions and subagents locally on your Mac.
Array — Runs Claude Code, Codex, and Pi side by side on one canvas.
Reviewer Agent — It uses a separate AI model to review code and prevent premature agent stopping.
Diff Tour — Generates guided reviews of git branches with read-only LLM permissions.
agent.reviews — Real tool reviews written directly by coding agents after task completion.
OpenCode — Works with 75+ model providers, local models, and existing subscriptions
Reviu — Review agent diffs, send fixes back, and clean branches with real Git before opening PRs.
What The Diff — It automatically writes pull request descriptions and summarizes code changes.
Crit — It keeps human feedback localized and precise for AI agent code iterations.

All Diffity alternatives