§ diff

diff.

Side-by-side input, unified diff output. Useful for comparing log lines, config snippets, output of two test runs — anything where reaching for git or vimdiff is too much ceremony.

algorithm

Myers O(ND) diff on lines. inline implementation, no library, ~50 lines.

scope

line-level only. for word/char-level you want a fancier UI than this; this trades depth for instant results.