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Your next review, already waiting.
Your PRs first. Requested reviews next. An inbox that stays in sync with GitHub, with pins for the repos and pull requests you keep coming back to.
- Automatic repo discovery
- Live PR updates
A new perspective on pull requests
See the story
in every diff.
Less piecing it together. More understanding.
A desktop home for GitHub reviews, with AI beside the code.
macOS · Apple silicon / Private alpha. Public release on the way.
Explore the review workflow
The explanation follows the code.
Sample PR #9The schema backfill sample, with Claude’s risk summary beside the actual SQL diff.
Understand the change before reading the diff.
Sample PR #1A real Claude Code overview of the invitation sample PR, connecting the intended behavior to what the code actually does.
A question becomes an inline conversation.
Sample PR #9An actual AI reply about the selected migration lines. The conversation is private; preparing and publishing a GitHub draft are separate actions.
Full-window screenshots from the real macOS app using sample PRs in the Diff City repo. Guides generated with Claude Code · Fable 5.1. Source repo currently private.
GitHub/ Codex/ Claude Code
From open PR to informed feedbackA review that reads
A review that reads
like a conversation.
For your own work, your teammate’s work,
and the changes that deserve a closer look.
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The important changes come first.
Read a rich overview, then scroll through a guided walkthrough. Follow explanations beside the code, inspect deeper notes, and expand routine changes when you need them.
- Risk-aware ordering
- Markdown + Mermaid
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Think it through. Then send it.
Ask about a line, a range, or a single variable. Run independent conversations with your AI. Keep notes private, or turn an answer into a draft for the PR author.
- Concurrent conversations
- Explicit GitHub publishing
Built for the second lookStay in the flow.
Stay in the flow.
Keep the context.
The little things that make a big diff feel manageable.
Review the delta
See just the changes since your last review, or return to the full PR.
Room for the code
Fast, virtualized diffs. Sticky file headers. A minimap for the long files.
More than one perspective
Generate guides with Codex and Claude, then switch between them.
Make it your workspace
Light and dark themes, keyboard navigation, and accessible controls.
Currently in private alphaYour next review
Your next review
could feel different.
Diff City is starting on Mac. Built with Tauri, designed around GitHub, and headed for an MIT-licensed open-source release.
Follow the project on GitHub The repository is private for now. It will live at crs48/diffcity.diff.city
Diff City for Mac
macOS 14+ · Apple siliconPublic download coming soon.
We’re refining the review experience before the first public build. The download will appear here when it’s ready.
Project on GitHubBring your GitHub CLI login and a local Codex or Claude Code login. No Diff City account required.
A few things to know.
Does my code stay on my Mac?
Your review workspace, notes, and guides are stored locally. When you ask AI or generate a guide, relevant code and context are sent to your chosen provider through your local Codex or Claude Code login. GitHub drafts stay private until you explicitly publish them.
Can I use my existing AI subscription?
Diff City connects to the local Codex and Claude Code tools you’re already signed into. Model availability, usage limits, and billing follow that provider account. You can choose a default model and generate separate guides with different models.
Is Diff City open source?
That’s the plan. The repository is currently private while the app takes shape. The public release will be MIT licensed and available at github.com/crs48/diffcity.
What platforms will it support?
The current alpha targets Apple silicon Macs running macOS 14 or later. Windows, Linux, and Intel Mac downloads are not available yet.