Analyze any website for free and see the technologies, CMS, hosting, DNS, WHOIS, SSL, sitemap and SEO signals behind it — live public data, no signup.
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SeoMods Site Explorer is a free website analysis tool: enter any domain and it profiles the site from live, public data — the technologies and CMS it runs on, its hosting and infrastructure, DNS and WHOIS records, SSL and security headers, sitemap structure and on-page SEO signals. No signup, no limits.
That makes it a practical starting point for competitor research and for technical checks on your own site. Instead of running a dozen separate lookups — one for DNS, another for WHOIS, another for the certificate — you get one structured profile of how a website is built and what it invests in, in about the time it takes to load a page. Everything it reports is information the site already publishes.
A site explorer is a website analysis tool that investigates the publicly available technical, domain, infrastructure and SEO information of a website. You give it an address; it reads what that address exposes to any visitor — the HTML of the page, the server's response headers, the TLS certificate, public DNS and WHOIS records, robots.txt and the XML sitemap — and organises it into a readable profile.
SeoMods does that in a single pass. The explorer fetches the homepage, fingerprints the software behind it, resolves the domain's records, checks the certificate and sitemap, then groups everything into sections you can scan: domain overview, technology profile, tracking IDs, SEO snapshot, structured data, indexability, security headers, SSL, server and hosting, DNS, WHOIS, link profile, social profiles and top pages. If you want the background first, our guide on what a site explorer is and how to analyze any website free walks through the same workflow step by step.
One domain, one run, and the report covers the areas most people would otherwise check with separate tools:
The explorer identifies the software a site is built and served with: the CMS or site builder, the JavaScript framework or library set, the CSS framework, the web server, the programming language, the CDN in front of it and the fonts, analytics, tag managers, advertising and consent tools loaded on the page. Detection is passive — it reads public HTML, response headers and cookies — so it sees what a browser sees.
Common platforms such as WordPress, Shopify, Wix, Squarespace, Drupal, Joomla, Magento, Ghost, Webflow, HubSpot and others are recognised from their public fingerprints, and where a site publishes it in the generator tag, the version is shown too. Fully custom or heavily proxied builds may return fewer matches — the report shows what is genuinely detectable rather than guessing.
When a site runs WordPress, the explorer reads the asset paths in its homepage HTML, so the active theme folder and the plugin folders loading scripts or styles on that page are listed by name. That is usually enough to see whether a site uses a page builder, a commercial theme or a particular SEO, cache or form plugin. Two limits apply: only plugins that load something on the page you analyse can appear, and caching or asset-combining plugins that merge files into a single bundle hide the individual folder names. Shopify themes are named the same way when the store exposes them.
You also see where the site actually lives: IP address, reverse DNS, ASN and network owner, hosting country, the CDN or proxy in front of the origin, and the HTTP version negotiated (HTTP/1.1, HTTP/2 or HTTP/3). To dig into a single address on its own, the IP & Geolocation Lookup and the HTTP Header Checker cover the same ground in more detail.
The DNS section lists the live records for the domain — A and AAAA for the host, MX for mail, NS for the authoritative name servers, plus TXT and CNAME entries — and names the mail and DNS providers it recognises. For record-by-record work, including a specific type, use the dedicated DNS Records Lookup tool.
Registrar, creation and expiry dates, domain status and calculated domain age come from the public WHOIS record. Since privacy rules took effect, most registrant names and emails are redacted by registrars, so expect the dates and registrar to be reliable and the contact fields to be masked. The full WHOIS lookup shows the complete raw record, and the Domain Age Checker isolates the age; our WHOIS lookup guide explains how to read one.
The explorer completes a live TLS handshake to report the certificate issuer, validity window and the hostnames it covers, and audits the response for HSTS, Content-Security-Policy, X-Frame-Options, X-Content-Type-Options, Referrer-Policy and Permissions-Policy. That is enough to tell whether a site takes transport security seriously. For expiry monitoring on a single domain, use the SSL Certificate Checker.
robots.txt and the XML sitemap are read to estimate how large the site is, which pages it treats as important, and how its content is organised into sections such as /blog/ or /products/. Top pages are listed with their titles, so the shape of a site's content strategy becomes visible quickly. The Sitemap Finder & Validator locates sitemaps that aren't declared, and the top pages report goes deeper into topics.
For the homepage you get the on-page essentials: title and meta description with their lengths, H1 count and text, canonical, meta robots and indexability, declared language, viewport, word count, Open Graph and Twitter cards, Schema.org / microdata / RDFa types, compression, caching and the internal, external and nofollow link counts. For a full page-level audit of your own site, run the On-Page SEO Audit or the complete website analysis instead.
Used on its own, Site Explorer works as a website technology checker: it answers "what is this site built with?" without installing a browser extension. The tech profile groups what it finds into CMS and site builder, frameworks and JavaScript libraries, CSS frameworks, server software and language, CDN and hosting, analytics and tag managers, advertising and pixel networks, fonts and cookie or consent platforms — plus the public GA4, GTM, AdSense and Facebook Pixel IDs present in the markup.
Two honest limits are worth knowing. Detection is based on public fingerprints, so software that leaves no trace in the HTML, headers or cookies — most back-office and server-side systems — will not appear. And a CDN or aggressive caching layer can hide details of the origin server. Read the result as "this is what the site shows publicly", not as a complete inventory.
Enter a competitor's domain and you learn how their site is put together before you plan against it: the platform and stack they chose, the infrastructure and CDN they pay for, how old the domain is, whether their technical foundations (HTTPS, security headers, canonicals, structured data) are solid, how many URLs their sitemap declares, which sections carry the most pages, and which social profiles they link to. Profile a site and you might find it runs WordPress behind a CDN, the domain is eight years old with roughly 240 sitemap URLs, its biggest section is /blog/ and it links to four social accounts — a clear picture of an established, content-driven rival.
A repeatable competitor research workflow looks like this:
competitor.com or the full address, either works — and run the analysis.It is equally important to be clear about what this is not. Site Explorer has no backlink index, no traffic estimates and no keyword database — those need licensed crawl data, and no free public source provides them. For link research use the Backlink Checker / Verifier and the Link Intersect / Backlink Gap, for topic gaps the Content / Keyword Gap, and for authority comparison the DA / PA Checker — Domain & Page Authority. Our competitor analysis guide shows how the pieces fit into one workflow.
The two answer different questions. Site Explorer is built around live public data, so it is fast, free and current: it tells you what a website is right now — its stack, hosts, records, certificate, structure and on-page signals — with no account and no per-check credits. That covers most reconnaissance work.
Paid platforms are built around proprietary indexes: crawled backlink graphs, keyword databases and traffic models accumulated over years. Those answer historical and estimative questions — how many domains link here, what does this site rank for, roughly how much traffic does it get — and SeoMods does not claim to replace them. What a free explorer gives you is:
Open Site Explorer was Moz's link research tool. Moz retired it in 2019 and replaced it with Link Explorer, but the old name is still typed into search every day by people who want one thing: a free way to look up what is behind a domain, without a subscription. SeoMods is an independent project with no affiliation to Moz and no copy of its link index — what it offers is the site-profiling half of that job, free.
The difference in scope is worth stating plainly:
For the link side of the work, the Backlink Checker / Verifier verifies whether specific pages actually link to you, the Link Intersect / Backlink Gap finds domains linking to rivals but not to you, and the DA / PA Checker — Domain & Page Authority returns a third-party authority score for a domain.
Every figure in the report is read live at the moment you run it, from sources any visitor can access: the site's own homepage HTML, its HTTP response headers and cookies, the TLS certificate presented during the handshake, public DNS records, the public WHOIS record, robots.txt and the XML sitemap. Nothing is bought, scraped from a private index or estimated behind the scenes.
That also explains why results can change. Sites served through a CDN may answer differently by region; consent walls, bot rules or aggressive caching can hide parts of the page; WHOIS output varies by registry and hides most contact fields by design; and a sitemap only reflects what a site chooses to declare. You do not need an account to run a check, and the domains you look up are public addresses — there is nothing private about the information returned.
Yes. It is completely free, with no usage limits and no paid tier. It runs on live public data rather than a licensed database, so there are no credits to buy.
No. There is no signup, login or email required — enter a domain and run the analysis.
Type the domain into the field at the top of this page and start the analysis. Site Explorer fetches the site live and returns one grouped report: technology and CMS first, then hosting and infrastructure, DNS, WHOIS, SSL and security headers, sitemap structure and the homepage's SEO signals. A run takes a few seconds, and you can repeat it for any number of domains.
Technologies and CMS, hosting and CDN, IP, ASN and country, DNS records, WHOIS registrar and dates, domain age, SSL certificate details, security headers, robots.txt and sitemap structure, top pages, homepage link profile, social profiles and the homepage's on-page SEO signals.
Yes — that is the most common use. Every check reads information the competitor publishes openly, so you can profile any domain: their platform, infrastructure, domain history, technical setup and content structure.
Yes, for anything with a public fingerprint: CMS, frameworks, JavaScript and CSS libraries, server software, CDN, analytics, tag managers, ad networks, fonts and consent tools. Server-side systems that leave no trace in the HTML, headers or cookies cannot be detected by any passive checker, including this one.
Yes. Mainstream platforms are recognised from their public markers, often with the version where a site publishes it in the generator tag. Custom-built or headless sites may show no CMS at all, which is itself useful information.
Yes. On WordPress sites it lists the active theme folder and the plugin folders that load assets on the homepage, taken from the /wp-content/ paths in the markup. Plugins that run only on other pages, or whose files are merged by a caching plugin, will not appear — so read the list as "at least these", not as the site's full plugin inventory.
Yes. The report resolves the domain's IP address, reverse DNS, ASN, network owner and country, and identifies the CDN or reverse proxy in front of the origin — Cloudflare, Fastly, CloudFront, Akamai, Vercel, Netlify and others — from response headers. When a CDN is in place it can mask details of the origin server, which the report notes rather than guesses around.
Yes — DNS records (A, AAAA, MX, NS, TXT, CNAME) and the WHOIS registrar, dates and status are part of every report. For deeper single-purpose lookups, use the DNS Records Lookup and the WHOIS Lookup.
No. It profiles a website's technology, infrastructure, domain and on-page SEO — not the links pointing at it. Backlink data needs a licensed crawl index; for link work use the Backlink Checker / Verifier to verify specific links and the Link Intersect / Backlink Gap to find prospects.
For site profiling, yes — with one honest caveat. SeoMods is not affiliated with Moz and does not hold its link index, so it replaces the "explore this domain" part of the job rather than the backlink data. Everything else — stack, hosting, domain, security, structure and on-page signals — is free and needs no signup.
Guides, tips and tutorials hand-picked for this tool — go from running a check to actually fixing it.
A free site explorer lets you profile any domain in seconds — tech stack, top pages, links, domain age and more. Here is what a site explorer shows, how to read it, and how to use it for competitor research.
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