Gitcasso – Syntax Highlighting and Draft Recovery for GitHub Comments
I built a browser extension called Gitcasso which: - Adds markdown syntax highlighting to GitHub textareas - Lists every open PR/issue tab and any drafts - (Optional, unimplemented) autosaves your comment drafts so you don’t lose work I made it because I was impressed by https://overtype.dev/ (a markdown textarea syntax highlighter) which went big on here on HN a few weeks ago, and it seemed like a perfect fit for a GitHub browser extension. Keeping up with changes on upstream GitHub would normally be a pain, but with with Playwright and Claude Code it seemed possible for…
In plain words
Gitcasso is a browser extension for GitHub that adds markdown syntax highlighting to comment textboxes and displays a sidebar listing open pull requests, issues, and draft comments. Built for developers who write frequently on GitHub, it helps improve code readability while drafting responses. The extension is open source under Apache 2 license, with optional autosave functionality for draft recovery currently in development.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
I built a browser extension called Gitcasso which: - Adds markdown syntax highlighting to GitHub textareas - Lists every open PR/issue tab and any drafts - (Optional, unimplemented) autosaves your comment drafts so you don’t lose work I made it because I was impressed by https://overtype.dev/ (a markdown textarea syntax highlighter) which went big on here on HN a few weeks ago, and it seemed like a perfect fit for a GitHub browser extension. Keeping up with changes on upstream GitHub would normally be a pain, but with with Playwright and Claude Code it seemed possible for it to be nearly automatic, which has turned out to be mostly true! This was the first time where I built a tool, gave the tool to AI, and then AI used the tool to make the thing I hoped it would be able to make. I'm pretty sold on the general technique... GitHub repo (Apache2-licensed, open source): https://github.com/diffplug/gitcasso Video walkthrough (2 mins of the tool, 12 mins of its development tooling): https://www.youtube.com/watch?v=wm7fVg4DWqk And a text writeup with timestamps to the video walkthrough https://nedshed.dev/p/meet-gitcasso
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