Markdown Diff Cat for GitHub

Shows Markdown changes in GitHub pull requests as rendered diffs with only the changed parts. Unofficial; not by GitHub.

AI coding assistants write long design documents, and reviewing them in a pull request is painful. • GitHub's rich diff renders the whole file, so you scroll past hundreds of unchanged lines to find what changed. • The source diff shows only the changes, but they are buried in Markdown syntax, tables, and code fences. Markdown Diff Cat gives you both: the rendered document, with only the changes in view. WHAT IT DOES • Opens every Markdown file (.md, .markdown, .mdx) in the rendered view for you. • Folds unchanged sections into one-line bars. Each bar shows how many blocks it hides and the last heading inside. Click a bar to peek, or expand the whole file. • Tables: when one row changes, GitHub shows the whole old table and the whole new table. Markdown Diff Cat merges them into one table with only the changed, added, and removed rows, and shows changed cells as old → new. Switch to the original tables any time. • Stays out of your way: click <> to leave a comment and it will not switch that file back. Files that already have review comments stay in the source view. Collapsed or Viewed files stay collapsed. • Color icon means on, gray icon means off. Click the toolbar icon to switch. Works on both the new and the classic pull request "Files changed" pages. PRIVACY No data collected. No network requests. No remote code. It runs only on github.com, and your on/off setting stays on your device. Unofficial. Not affiliated with or endorsed by GitHub. GitHub is a trademark of GitHub, Inc. Source code: https://github.com/drum-grammer/GITHUB-MD-DIFF