Odiff
lastmod 2026-11-10created 2020-12-142 edits
odiff is a CLI tool that compares two images pixel by pixel to find differences. It is used in visual regression testing to determine whether screenshots have changed, and outputs a result image with the differing regions highlighted in color. It is written in OCaml and distributed as a native binary, and is characterized by its emphasis on speed over JavaScript tools such as pixelmatch.
The fastest pixel-by-pixel image visual difference tool in the world.