Which captcha
does this page use?

Paste the page URL into the detector. It reads the page and reports the site key from the data-sitekey attribute, the render= parameter of the reCAPTCHA script, or the page's own JavaScript. If the key is set later by script, open devtools and look for the k= parameter in the URL of the reCAPTCHA iframe.

reCAPTCHA v3 loads its script as api.js?render= followed by the site key, shows no checkbox and is called with grecaptcha.execute and an action name. v2 shows the I'm not a robot checkbox, or runs invisibly when a form is submitted, and usually uses a .g-recaptcha element.

The detector reads the HTML the server returns. Many sites only add the captcha after you open a login or sign-up form, or inject it with JavaScript later. Try the exact URL of the form. Some sites also block automated requests before any HTML is returned, which the detector reports as the HTTP status.

The API solves reCAPTCHA v2, v3 and Enterprise checkbox widgets, Cloudflare Turnstile, DataDome with your own proxy, and image or text captchas. The detector also names hCaptcha, GeeTest, Arkose and others so you know what a page uses, and marks those as not supported.

Yes. It needs no account and is limited to 30 checks an hour from one network. It only fetches the public page you enter, the same way a browser's first request would, and does not store the result.