Altova DiffDog vs icdiff

Altova DiffDog has no write-up on Specifiction yet; its figures are above.

icdiff is a free, open-source command-line program for comparing two files in a side-by-side terminal view. It emphasizes small changes within existing lines that may be difficult to spot with standard diff, rather than replacing diff for every situation. Users can highlight changes with foreground or background colors and customize the color map. Display options include line numbers, labels, whole-file output, whitespace highlighting, line truncation, and recursive directory comparison. The tool works with Git, Subversion, and Mercurial and supports two-way comparisons, not three-way merges. Installation methods listed by the maker include pip, apt, Homebrew, AUR, and Nix. It runs on Linux and macOS as a command-line tool that can be placed on the PATH. Input and output default to UTF-8, with command-line encoding options. Screen-width autodetection is Unix-only, and exclude-lines cannot be combined with line numbers.