Find what any website is built with

How this tech stack detector works

Enter a public URL and ToolTrace fetches the page, including its HTML source and HTTP response headers. The detector scans multiple signal sources to identify technologies:

• HTTP headers reveal web servers (Nginx, Apache), CDN providers (Cloudflare, Fastly), hosting platforms (Vercel, Netlify), and runtime environments (PHP, ASP.NET, Express).
• Meta generator tags identify CMS platforms like WordPress, Shopify, Ghost, Hugo, Drupal, and Joomla, often with version numbers.
• Script and stylesheet URLs point to analytics services, JavaScript frameworks, CSS libraries, marketing tools, and third-party integrations.
• HTML patterns and DOM structure contain framework-specific attributes, class naming conventions, and data attributes that indicate which front-end technologies are in use.
• Cookies set by the server can identify session management frameworks, e-commerce platforms, and authentication systems.

Each detection includes a confidence level and specific evidence explaining why the technology was identified. The free tool performs a static fetch of the target URL. For sites that rely heavily on JavaScript rendering, the API supports browser-based rendering at a higher credit cost.

Technologies and categories we detect

The detector currently recognizes 90+ technologies across these categories:

• CMS: WordPress, Shopify, Wix, Squarespace, Webflow, Drupal, Joomla, Ghost, Hugo, Gatsby, HubSpot CMS, Contentful, PrestaShop, Magento, Weebly, Blogger, Astro
• JavaScript frameworks: React, Next.js, Vue.js, Nuxt.js, Angular, Svelte, Remix, Ember.js, Alpine.js, HTMX
• JavaScript libraries: jQuery, Backbone.js
• CSS frameworks: Tailwind CSS, Bootstrap, Bulma, Foundation, Material UI
• Analytics: Google Analytics, Hotjar, Mixpanel, Plausible, Fathom, Segment, Heap, Amplitude, PostHog, Matomo, Microsoft Clarity
• E-commerce: WooCommerce, BigCommerce, Stripe, PayPal
• CDN and hosting: Cloudflare, Fastly, Amazon CloudFront, Akamai, Vercel, Netlify
• Web servers: Nginx, Apache, LiteSpeed, Caddy, IIS
• Marketing and support: HubSpot, Mailchimp, Intercom, Drift, Zendesk, Crisp, LiveChat, Tawk.to
• Security: reCAPTCHA, hCaptcha, Cloudflare Turnstile
• Other: Google Fonts, Adobe Fonts, Font Awesome, Webpack, Vite, Sentry, Datadog, New Relic, Firebase, Supabase, Algolia, Cookiebot, OneTrust

The signature database is regularly expanded. If a technology is not detected, it may use patterns that are not yet covered, or the site may load its resources after JavaScript executes.

How teams use tech stack detection

Competitive research

Understand what frameworks, analytics, and infrastructure your competitors use. If a competitor recently switched from one CMS to another, that signals a technical investment worth understanding. If they added a specific analytics tool, it might indicate a shift in their measurement strategy.

Sales and lead qualification

Enrich prospect data with technology signals. If you sell a Shopify app, knowing which prospects use Shopify saves outreach effort. If you sell a WordPress plugin, filtering leads by CMS lets your team focus on qualified accounts.

Security and compliance audits

Inventory publicly observable CMS versions, server signals, and third-party scripts as a starting point for an authorized review. Detection is not a vulnerability scan and does not prove that a technology or version is insecure.

Vendor evaluation

Before committing to a platform, check what successful sites in your industry use. If the top ten competitors in your niche all use a specific CDN, that is a strong signal worth evaluating.

Integrate tech stack detection into your workflow

The free web tool is designed for one-off lookups. For bulk analysis, lead enrichment pipelines, monitoring dashboards, and automated research, use the ToolTrace Tech Stack API.

The API accepts a URL and returns structured JSON with categorized technology detections, confidence levels, and evidence. It uses the same credit-based pricing as the rest of the ToolTrace platform. Static detection costs 1 credit per request, and browser-rendered detection costs 5 credits.

Compare plan limits on the pricing page and read the API documentation for request and response examples.

Questions about tech stack detection