Free Website Analyzer
Full technical audit in seconds: DNS, WHOIS, SSL, SEO, email and technology. Score 0-100 with quick wins. No sign-up.
Built by
Miguel Ángel Colorado Marin (MACM)
Built by
Miguel Ángel Colorado Marin (MACM)
Full-Stack Developer · Guadalajara, España
I develop web apps, digital tools and full projects — from design to deployment.
How to use the website analyzer?
- 1
Enter the domain
Type the domain or URL of the site to analyze (e.g. example.com). The tool accepts domains with or without the https:// protocol.
- 2
Click Analyze
Click Analyze or press Enter. 7 analyses run in parallel: DNS, WHOIS, SSL, redirects, subdomains, email security and full page analysis.
- 3
Review the score and quick wins
You get a global score 0-100 with the 3 most urgent issues at the top. The score combines SEO (40%), email security (20%), SSL (20%) and TTFB performance (20%).
- 4
Explore each section
Click on Infrastructure, Security, SEO, Performance or Technology to see the detailed diagnosis with actionable recommendations and concrete tips.
What does the analysis include?
7 parallel analyses covering the most important technical aspects of any domain.
DNS Records
A, AAAA, MX, TXT, NS, CNAME and SOA records queried in real time via Cloudflare DNS-over-HTTPS. Essential for mail and propagation diagnostics.
WHOIS / RDAP
Registrar, creation date, expiration date, nameservers and domain status. Useful for knowing when a domain expires or who manages it.
SSL / TLS
Issuer, validity dates, days remaining, SANs, protocol and grade A+→F. Detects expired or misconfigured certificates before they affect users.
Redirect chain
Traces each HTTP hop with status code and time. Identifies long chains that hurt SEO performance or insecure HTTP→HTTPS redirects.
Email security (SPF · DKIM · DMARC)
Verifies the three anti-spoofing mechanisms. Without them, anyone can send emails impersonating your domain. Each missing one lowers the score.
On-page SEO (19 checks)
Title, meta description, H1, canonical, viewport, lang, charset, og_tags, Twitter Card, JSON-LD, favicon, images without alt, word count, robots.txt, sitemap.xml and more.
Tech stack
Detects server (Nginx, Apache, Cloudflare), CDN (Vercel, Netlify, Fastly), framework (Next.js, Nuxt, Remix), CMS (WordPress, Shopify, Webflow) and analytics (GTM, GA4, Hotjar).
Frequently asked questions
What does this tool analyze?
The Web Analyzer runs 7 analyses in parallel: DNS records (A, AAAA, MX, TXT, NS), WHOIS/RDAP (registrar, dates, nameservers), SSL/TLS (issuer, expiry, grade), redirect chain, subdomains via Certificate Transparency, email security (SPF, DKIM, DMARC) and page analysis (19 SEO checks, tech stack, TTFB performance).
How is the score calculated?
Global score = 40% SEO + 20% email security + 20% SSL + 20% performance (TTFB). SEO measures 19 checks. Email adds SPF (+30), DMARC (+30 base, +20 if reject) and DKIM (+20). SSL converts grade to points. TTFB <300ms = 100pts, <600ms = 85pts, <1s = 70pts…
Is the data stored?
No. All analyses run in real time and are returned directly to your browser without being stored on any server. The history of the last 5 searches is saved only in your browser (localStorage).
How long does the analysis take?
Between 3 and 8 seconds. The 7 analyses run in parallel and results appear progressively. DNS usually arrives in under 1 second; subdomain discovery may take longer as it queries Certificate Transparency logs.
Can any domain be analyzed?
Any public domain. The tool blocks private IPs (192.168.x.x, 10.x.x.x), localhost and reserved ranges to prevent misuse. Only real public domains are analyzed.
Is it legal to use this analyzer?
Yes. The analysis is completely passive and only queries public data that anyone can access: DNS (public name resolution system), RDAP/WHOIS (public domain registry accessible to any Internet user), Certificate Transparency (public TLS certificate logs managed by Google, Cloudflare and others), and the site's public web page as any browser would see it.
This is exactly what tools like SSL Labs, Wappalyzer, Google Search Console, SEMrush or any SEO crawler do. We don't perform port scanning, don't look for vulnerabilities, don't execute code on the target server and don't process personal data (GDPR doesn't apply). Analyses are not logged on any server.
Embed this tool
You can integrate this website analyzer in your blog or website by copying the following iframe:
<iframe src="https://miguelacm.es/embed/web-analyzer" width="100%" height="700" style="border:none;border-radius:12px;" loading="lazy"></iframe>
Want to see how it's made? The source code is available on GitHub.
View on GitHub