Two files are compared and a new TeX file is output. When the output file is processed with (La)TeX it marks new changes with blue and old text with red with a strike-through line. Furthermore, passages with changes are marked at the margin with grey bars by the LaTeX changebar package.

See also ltxdiff.

The authors are Mark Doll and Cengiz Günay. The package is Copyright © 2006-2009 Mark Doll and Cengiz Günay.