Show HN: A Simple Diff-Based Copyediting Tool

I seem to do a lot of copyediting these days (of friends' papers, application essays, stories, letters, and the like), and keep wishing there was a super-simple way to track my changes and present them to the writer in a visually intuitive way.

This "diffly" app is my first cut at a solution.

It uses Google's diff-match-patch to do the diff. There's no toolbar or lasso or any of that - comments use the Markdown hyperlink syntax, and insertions/deletions are tracked automatically.