Technology Checker

The Technology Checker is a free tool that inspects any public page live and reports exactly what's powering it — the CMS or e-commerce platform it runs on, the JavaScript and CSS frameworks it loads, the analytics and tag management tools it uses, and infrastructure details like its CDN and server software. Rather than piecing this together from browser dev tools and guesswork, you get a single, clear breakdown built from the same signals — script sources, meta tags, and response headers — that reveal a site's stack to anyone who knows where to look.

It exists because knowing a site's stack is genuinely useful in a lot of everyday situations: sizing up how a competitor built a feature you're trying to replicate, sanity-checking your own site's setup after a migration, or figuring out why a page performs the way it does before assuming it's a content problem. It works on any public page, not just your own, which makes it just as useful for research as it is for auditing.

When you submit a URL, the tool fetches the page's live HTML and HTTP response headers and scans them for known signatures — a specific script path or global JavaScript variable tied to a framework, a meta generator tag naming a CMS, a distinctive header value revealing a CDN or server, and similar telltale markers built up from how each platform and tool typically ships its code. Each match is attributed to the technology it identifies and grouped into categories like CMS, framework, analytics, and infrastructure.

This is signature-based detection against the page's initial HTML response, not a full browser render — technologies that load dynamically after the page renders, or that are deliberately obfuscated, may not always be caught. A clean or partial result reflects what's detectable from the public-facing markup and headers at the moment you run the scan, not necessarily an exhaustive list of everything running behind the scenes.

• Know your stack before migrating or replatforming. Seeing exactly what's currently in use — CMS, frameworks, analytics — makes a redesign or platform switch far less risky than guessing at what needs to be replicated.
• Watch for outdated software versions that are publicly detectable. An old CMS, plugin, or framework version visible in a page's markup is a common, easy target for automated attacks looking for known vulnerabilities.
• Pay attention to which CDN a site uses. It can explain a lot about load times in different regions, and comparing your own CDN choice against faster competitors can surface an easy performance win.
• Use a competitor's tech stack as research, not a template. Seeing what's popular in your industry is useful context, but the right stack for your site depends on your own team, traffic, and content needs.