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Diff Shuttle

A small web app to compare text, code, JSON, and CSV side by side. Everything runs in the browser; no data is sent to any server.

🔗 Try it live: Free online text & code diff checker — compare text, code, JSON & CSV side by side in your browser.

Features

  • Five diff modes – line, word, character, JSON, and CSV comparison via the npm diff library
  • Side-by-side / unified views – switch how differences are displayed
  • Smart options – ignore whitespace and/or letter case
  • File support – drop in source files (js, ts, py, go, java, css, md, sql and more), up to 10 MB each
  • Export – download the diff result with statistics as text
  • Bilingual – English and Chinese UI

Run locally

npm install
npm run dev

Open http://localhost:3000.

Build

npm run build

Static export to out/.

License

Licensed under the GNU Affero General Public License v3.0 — see LICENSE.

Free to use, modify, and self-host. If you run a modified version as a network service, you must open-source your modifications (AGPL §13). For commercial licensing without copyleft obligations, contact support@shuttlelab.org.