How it runs. Sift fetches each target server-side via
analyze.php, so it isn't blocked by browser CORS the way a page-only tool would be.
Upload index.html and analyze.php together into the same folder on your server (PHP with the cURL extension). It reads only public data:
page source, response headers, public DNS, and RDAP/WHOIS. First time? Load check.php to confirm your server is set up.