knobs is a free panel that shows your site the way your users see it: on an iPhone, in dark mode, in Arabic, in another time zone or with reduced motion.

Use the Chrome extension on any site, or add the npm package @vinena/knobs to your own app, in development only. Switch the color scheme, contrast, text size, locale and right-to-left text, time zone, clock, geolocation and device frame from one place, without changing your computer settings.

When something breaks, knobs copies the element with its html, the components that rendered it and their source files, so a coding agent can fix it.

Free and open source (MIT license). Made by Vinena Studio.