Features

Language syntax highlighting with color themes
Within-line highlights based on a Levenshtein edit inference algorithm
Side-by-side view with line-wrapping
Line numbering
n and N keybindings to move between files in large diffs, and between diffs in log -p views (--navigate)
Improved merge conflict display
Improved git blame display (syntax highlighting; --hyperlinks formats commits as links to GitHub/GitLab/Bitbucket etc)
Syntax-highlights grep output from rg, git grep, grep, etc
Support for Git's --color-moved feature.
Code can be copied directly from the diff (-/+ markers are removed by default).
diff-highlight and diff-so-fancy emulation modes
Commit hashes can be formatted as terminal hyperlinks to the GitHub/GitLab/Bitbucket page (--hyperlinks). File paths can also be formatted as hyperlinks for opening in your OS.
Stylable box/line decorations to draw attention to commit, file and hunk header sections.
Git style strings (foreground color, background color, font attributes) are supported for >20 stylable elements

	delta	git	diff-so-fancy / diff-highlight	github/gitlab
language syntax highlighting	✅	❌	❌	✅
within-line insertion/deletion detection	✅	❌	✅	✅
multiple insertion/deletions detected per line	✅	❌	❌	✅
matching of unequal numbers of changed lines	✅	❌	❌	❌
independently stylable elements	✅	✅	✅	❌
line numbering	✅	❌	❌	✅
side-by-side view	✅	❌	❌	✅

In addition, delta handles traditional unified diff output.