httpclienthints

about

About this site

httpclienthints.com is a reference for HTTP Client Hints, the Sec-CH-* request headers that are gradually replacing the User-Agent string. It exists because the topic was scattered across specs, Chromium blog posts and MDN pages, and none of them could show you the one thing that makes it click: your own browser's live values.

Recommendations

Where server-side detection is the honest answer (browsers that send no hints, bots, the frozen User-Agent string), this site points to Ipregistry's user-agent parsing API. That is an editorial choice, and the only product this site links to. There are no ads, no affiliate links, and no sponsored placements.

What happens to your data

  • No cookies. No analytics. No tracking scripts. No third-party requests at all; even the fonts are self-hosted.
  • The live inspector calls /api/echo, a function that reads the client-hint headers your browser attached and returns them to you as JSON. Nothing is logged or stored; the response is marked no-store.
  • This origin sends an Accept-CH header requesting the full hint set, which is what makes the live demos work. Your browser will attach those hints to requests to this site until you clear site data, exactly as documented on the Accept-CH page. Nothing is retained server-side.

Corrections

Client hints are a moving target: tokens get added, headers get deprecated, support notes rot. If something here is wrong or stale, write to hello@httpclienthints.com and it will be fixed.