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Web Diagnostics Toolkit

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Web Diagnostics Toolkit by BitHub brings 13 technical website checks together in one free tool for developers, SEO specialists, webmasters and sysadmins. Enter a URL to run a Google Lighthouse audit (performance, accessibility, SEO and best practices), read real-user Core Web Vitals from CrUX, check the TLS certificate, look up WHOIS registration and DNS records, measure HTTP latency, review security headers, follow redirect chains, find robots.txt and sitemaps, and parse SPF and DMARC email records. It also detects HTTP/2 and HTTP/3 support and includes a Green Audit check. The web version runs every check a browser can perform; the native iOS and Android apps add a full SMTP handshake test and ALPN protocol detection. No account or setup is required, and the values you enter are not sent to Google Analytics. Free on the web, the App Store and Google Play.

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