Here's a screenshot of some side-by-side diff action: https://fr.atlassian.com/wac/software/fisheye/overview/screenshot-tour/featureItems/0/featureItems/0/image

Here's a screenshot of some side-by-side diff action: https://fr.atlassian.com/wac/software/fisheye/overview/screenshot-tour/featureItems/0/featureItems/0/imageBinary/fisheye-side-by-side-diff.png https://fr.atlassian.com/wac/software/fisheye/overview/scree... Basically, it let's you look at the old code, or look at the new code, or see how they're different, all at the same time. Inline diffs (github-style) require you to keep a context as you scan through code, and it makes it harder to keep everything in your head.