See every millisecond of a web request.
Paste a URL. A sandboxed probe runs curl against it and shows timing, redirects, TLS and headers.
Public addresses only · stops at 15 s, 5 MB or 10 redirects · free, no sign-up
An online curl that shows what happened, not just the response
curlscope runs the real curl command from a sandboxed server, so you can test a URL without installing anything or opening a terminal.
- Timing for every phase
- DNS lookup, TCP connect, TLS handshake, request sent, server wait and download, measured by curl and drawn on one time axis. Find out whether a slow request is the network, the handshake or the server.
- Redirect chains, hop by hop
- See every redirect with its status code, Location header and time cost, and spot loops or needless http-to-https and www hops.
- TLS and certificates
- Protocol version, cipher, and the certificate chain with issuer and expiry, so a handshake failure or an expiring certificate is easy to see.
- Headers and the raw trace
- Response headers, cookies and caching headers, plus the full curl verbose trace you would get in a terminal.
Free to use, no account needed. Every scan runs on a real server, so a coffee helps keep it running.