Measure performance and infrastructure health. TTFB, compression, CDN, caching, HTTP version, uptime, and more.
19 tools in this category
Robots.txt
Checks if a robots.txt file exists and parses crawl directives.
Sitemap
Checks for sitemap.xml and counts indexed URLs.
HTTP Security Headers
Checks security headers like HSTS, CSP, X-Frame-Options.
Redirect Chain
Follows redirect chain and flags loops or excessive hops.
Domain Age
Retrieves WHOIS data including domain registration date.
IP Lookup
Resolves IP address and retrieves hosting location and ISP.
DNS Records
Fetches A, AAAA, MX, NS, TXT, and CNAME records.
Tech Stack
Detects CMS, framework, CDN, and analytics tools from HTML and headers.
Broken Links
Checks up to 20 links on the page for HTTP errors.
HTML Validator
Checks HTML for missing doctype, duplicate IDs, deprecated tags, and more.
Compression
Checks if responses are compressed with Gzip or Brotli.
HTTP Version
Detects whether the site uses HTTP/1.1, HTTP/2, or HTTP/3.
Caching Headers
Checks Cache-Control, ETag, and Last-Modified headers.
CDN Detector
Detects Cloudflare, Fastly, CloudFront, Akamai, and other CDNs.
Uptime Check
Checks if the site is reachable and measures response time.
Carbon Footprint
Estimates CO₂ emissions per page view.
TTFB Checker
Measures Time to First Byte — server response latency in milliseconds.
Modern Image Formats
Checks if images use modern WebP/AVIF formats instead of legacy JPEG/PNG.
JS/CSS Minification
Checks whether JavaScript and CSS assets are minified for faster loading.