There's a diff match patch library in JavaScript that can be used for this. In fact, we did use it in Mozilla Bespin https://code.google.com/p/google-diff-matc

There's a diff match patch library in JavaScript that can be used for this. In fact, we did use it in Mozilla Bespin https://code.google.com/p/google-diff-match-patch/ https://code.google.com/p/google-diff-match-patch/ Diff match patch is not necessarily easier than OT.