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.

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.