What is that sitebuilt with?

What the Tech Stack Detector Finds

The Tech Stack Detector fetches any public URL and scans its HTML source and HTTP response headers against 75+ technology signatures across nine categories: CMS and website builders, e-commerce platforms, JavaScript frameworks, analytics and tracking, marketing and CRM tools, payment providers, CDN and hosting infrastructure, font services, and embedded widgets. Every detection includes the exact code snippet or header that triggered it, so you can verify the evidence yourself.

Common Uses for Technology Lookup

Competitor research is the classic use — see whether a rival runs Shopify or a headless storefront, which analytics stack they trust, and whether they invest in chat, A/B testing, or marketing automation. Agencies use stack detection before a pitch to tailor recommendations to the client's actual platform. Developers use it to sanity-check their own deployments: confirming the CDN is actually serving, tags fire from the raw HTML, and no forgotten tracking scripts linger from past campaigns.

Detection Honesty: What a Single Fetch Can and Cannot See

This tool inspects the initial HTML and response headers of one page. That covers the large majority of detectable technologies, but tools injected later by Google Tag Manager, server-side tracking, and markup rendered entirely client-side after load are invisible to a single fetch. Results therefore list what was found— a technology's absence from the list is not proof the site doesn't use it. For a deeper, multi-page analysis of how a site is built and how well it performs, run the full Website Health Check.