Inspect any site, API or network
Purpose-built checkers for the things that decide whether a site is secure, fast and correct — HTTP headers, status codes, SSL/TLS, DNS, CDN, REST APIs and side-by-side comparison. Each one runs in your browser with no account and nothing to install.
HTTP Header Checker
Enter a URL and read its raw response headers in plain language — status line, redirects, content type, caching, compression and every security header, grouped and explained.
Website InspectorSecurity Headers Scanner
Scan a URL for the response headers that stop clickjacking, XSS and protocol downgrade — see which are present, which are missing, and exactly how each one is configured.
Website InspectorSSL/TLS Certificate Checker
Look up the live certificate for any hostname — issuer, subject, validity window, the full chain of trust and the negotiated TLS version and cipher, so nothing expires by surprise.
Website InspectorHTTP Status Code Checker
Test a URL and read the status line the server actually sends — 200, 301, 404 or 500 — with the full redirect chain resolved and every code explained so you can fix it fast.
Website InspectorDNS Lookup Tool
Query a domain's live DNS and read its records in one view — A and AAAA addresses, mail routing, verification TXT records, nameservers and CAA policy, each with its TTL.
Network InspectorCDN Detector
Enter a URL and the Network Inspector reads the edge fingerprints — cache-status headers, server signatures, ASN and the network path — to identify the CDN delivering it.
Network InspectorREST API Tester
Compose a request with any method, headers and body, send it, and read the full response — status, timing, headers and pretty-printed JSON — with nothing to install.
API InspectorWebsite Comparison Tool
Put two URLs head to head and see their headers, security posture, TLS, timing, SEO signals and tech stack in a single aligned view — every difference called out.
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