Searchable file tree
Jump to any file in huge PRs. Filter as you type.
diffy
A better way to review GitHub pull requests
Full-screen diffs, searchable file tree, inline comments, batch reviews, viewed-file tracking, split/unified layout, 50+ themes, and under 2 MB.
Why diffy
Hundreds of files, large diffs, and heavy review threads hit documented limits and long-standing UX friction. diffy is built for exactly those reviews.
GitHub
diffy
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Diff too large to display
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Fetches the PR via the GitHub API and renders it in a dedicated viewer, bypassing the web UI diff renderer.
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Load diff on every large file
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Shows full file patches in one continuous scroll. No per-file load buttons.
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Slow, freezing Files changed tab
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Lightweight overlay with worker-based syntax highlighting. Stays responsive where GitHub's tab struggles.
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300+ changed files
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Uses the paginated files API to load every changed file, then assembles the full diff.
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Comments scattered across tabs
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Inline review threads on the lines you are reading, with reply, edit, and delete in context.
Built for serious PR review
Every feature ships in the extension today. Powered by Pierre's Trees and Diffs.
Comments/Review
Inline threads on the diff. Queue comments and publish in one shot.
Viewed files and progress
Per-file checkboxes sync with GitHub. Jump to what's left.
Customization
Split or unified layout, diff display options, collapse files, and refresh after new pushes.
50+ themes
Pierre, Catppuccin, Dracula, Nord, and more. Separate light and dark picks.
Overlay or standalone tab
Full-screen overlay on GitHub, or open in a dedicated tab.
Private repos
Optional GitHub token for private repos and higher rate limits.
PR stats & info
Sidebar panels for file, line, and comment stats plus branches, author, state, labels, and reviewers.
Full PR review workflow
Mark files as you read, queue comments in batch mode, then publish your verdict when the PR is covered.
01
Track viewed files
Check off files as you read through the PR. Progress syncs with GitHub and you can jump to the next unviewed file from the header.
02
Start Review
Toggle Start Review in the header. Comments queue locally as draft annotations on the diff.
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Queue as you read
Select lines and compose comments. They stay local until you publish. Closing with unpublished comments shows a confirmation.
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Publish in one shot
Finish review to choose Comment, Approve, or Request changes. All queued inline comments publish together via one API call.
How it works
Install, open a pull request in diffy, review. Overlay on GitHub or a dedicated tab.
01
Install the extension
Add diffy from the Chrome Web Store, Firefox Add-ons, or Microsoft Edge Add-ons.
02
Open a PR in diffy
A couple of ways to launch diffy: 1. View Diff on the PR page for a full-screen overlay (diffy prefetches as the page loads) 2. Right-click Open in diffy on a PR link or page for a standalone tab
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Review the full diff
Read, comment, mark files viewed, and publish reviews. Comments and approvals post directly to GitHub.
Auth and privacy
Your token stays in the browser. No data leaves the extension unless you post a review to GitHub.
No data collection
diffy does not collect personal data. No tracking, no telemetry, no analytics.
Token stored locally
Your GitHub token stays in browser.storage.local inside the extension. It never leaves your browser.
Optional authentication
Public PR diffs work without a token. Posting comments and private repos need a token. The full review flow needs a classic PAT or a gh auth token from gh auth login.
FAQ
What reviewers usually ask before installing.
On any GitHub pull request page, click View Diff for a full-screen overlay — diffy starts prefetching PR data as the page loads. To open in a separate tab instead, right-click the PR link or page and choose Open in diffy from the context menu.
Install diffy
Free on Chrome, Firefox, and Edge.
