kawari

kawari is a web app that generates diffs locally and lets you share them by encoding everything in the URL. No server, accounts, or tracking. Named after the Japanese word for “change” (変kaわwaりri).

Try it now • GitHub • Blog post

Screenshot of kawari showing a side-by-side diff of a Rust program, with additions in green and removals in red Screenshot of kawari showing a side-by-side diff of a Rust program, with additions in green and removals in red

Features

  • Private: texts never leave your browser
  • Shareable: the entire diff is compressed and stored in the URL
  • Side-by-side and unified diff views
  • Mini-map for navigating large diffs
  • Vim-like keyboard navigation (j/k)
  • Ignore options for whitespace and quote style differences
  • Service workers to avoid locking the browser on large diffs
  • Installable as a PWA for full offline functionality
  • No dependencies: vanilla JavaScript, HTML, and CSS