The StackOptic Blog
Practical guides on identifying website technologies, SEO and GEO, web performance and lead generation — from the team behind StackOptic.
How to Tell If a Website Uses Mixpanel
Mixpanel is a product-analytics platform for event tracking. Learn to detect it via the cdn.mxpnl.com script, the global mixpanel object, api.mixpanel.com/track beacons and mp_ cookies.
How to Tell If a Website Uses Klaviyo
Klaviyo is the leading email and SMS platform for ecommerce. Detect it via the static.klaviyo.com/onsite/js/klaviyo.js script with a company_id, the klaviyo global and __kla_id cookie.
How to Tell If a Website Uses Datadog
Datadog Real User Monitoring tracks front-end performance and errors. Detect it via the datadog-rum.js agent, the window.DD_RUM and DD_LOGS globals and browser-intake-datadoghq.com beacons.
How to Tell If a Website Uses Crazy Egg
Crazy Egg provides heatmaps, scrollmaps and A/B testing. Detect it via the script.crazyegg.com snapshot script, the CE2 global and _ce.s / _CEFT cookies.
How to Tell If a Website Uses Loox
Loox is a popular Shopify product-reviews app focused on photo reviews. Detect it via loox.io widget assets, the loox-reviews / Loox markup and its review-collection emails.
How to Tell If a Website Uses Elementor
Elementor is the most popular WordPress page builder. Detect it via the elementor- body and section classes, the /wp-content/plugins/elementor/ assets and the elementorFrontend global.
How to Tell If a Website Uses Font Awesome
Font Awesome is the most popular icon library. Detect it via fontawesome.com / cdnjs assets, the fa/fas/fab/far icon classes, and the SVG-with-JS or webfont rendering it uses.
How to Tell If a Website Uses Fathom Analytics
Fathom is a privacy-first, cookieless analytics tool. Detect it via the cdn.usefathom.com/script.js library, the data-site attribute, the window.fathom object and its cookieless beacons.
How to Tell If a Website Uses imgix
imgix is a real-time image-processing CDN. Detect it via *.imgix.net asset URLs and its query-string transformation parameters like auto=format, fit, w and dpr.
How to Tell If a Website Is Built With Joomla
Joomla is a veteran open-source CMS. Detect it via the generator meta tag, /media/system/ and /templates/ paths, the Joomla global, option=com_ URLs and the joomla-script-options script.
How to Tell If a Website Uses Cloudflare Turnstile
Cloudflare Turnstile is a privacy-first, frictionless CAPTCHA alternative. Detect it via the challenges.cloudflare.com/turnstile/v0/api.js script, the cf-turnstile div and the turnstile global.
How to Tell If a Website Uses Chartbeat
Chartbeat is a real-time editorial analytics platform for publishers. Detect it via the static.chartbeat.com script, the _sf_async_config global and pingjs/ping.chartbeat.net beacons.
How to Tell If a Website Uses Stripe
Stripe is the dominant developer-first payment platform. Detect it via the js.stripe.com/v3 script, the Stripe() global, Elements iframes, the __stripe_mid cookie and api.stripe.com calls.
How to Tell If a Website Uses Affirm
Affirm is a leading US buy-now-pay-later provider. Detect it via the cdn.affirm.com/js/v2/affirm.js script, the global affirm object, the _affirm_config and monthly-payment messaging widgets.
How to Tell If a Website Uses Intercom
Intercom is a leading customer messaging and support platform. Detect it via the widget.intercom.io and js.intercomcdn.com scripts, the window.Intercom object, intercomSettings and the app_id.
How to Tell If a Website Uses Google Fonts
Google Fonts is the most popular web-font service. Detect it via fonts.googleapis.com stylesheet links and fonts.gstatic.com font-file requests — and learn the GDPR implications of hosted fonts.
How to Tell If a Website Uses Material UI (MUI)
Material UI (MUI) is the most popular React component library. Detect it via Mui- prefixed class names, Emotion's css-<hash> classes and the data-emotion style tags in the DOM.
How to Tell If a Website Is Built With Nuxt
Nuxt is the leading Vue meta-framework. Detect it via the window.__NUXT__ hydration object, the #__nuxt root element and _nuxt/ build-asset paths.
How to Tell If a Website Uses Mailchimp
Mailchimp is the best-known email marketing platform. Detect it via list-manage.com signup forms, the mc-validate.js script, chimpstatic.com pop-ups and Mailchimp embedded form markup.
How to Tell If a Website Uses hCaptcha
hCaptcha is a privacy-focused reCAPTCHA alternative. Detect it via the js.hcaptcha.com/1/api.js script, the h-captcha widget div with data-sitekey, the hcaptcha global and hcaptcha.com iframes.
How to Tell If a Website Uses GSAP
GSAP (GreenSock) is the leading web-animation library. Detect it via the window.gsap global, the gsap.min.js script, ScrollTrigger and legacy TweenMax/TweenLite references.
How to Tell If a Website Uses Trustpilot
Trustpilot is the leading independent reviews platform. Detect it via TrustBox widgets from widget.trustpilot.com, the trustpilot-widget div with data-businessunit-id, and invitejs.trustpilot.com.
How to Tell If a Website Uses Sentry
Sentry is the leading error- and performance-monitoring platform for web apps. Detect it via the @sentry/browser SDK, the window.Sentry object, the DSN in Sentry.init() and ingest.sentry.io envelope requests.
How to Tell If a Website Uses Google AdSense
Google AdSense monetises sites with display ads. Detect it via the adsbygoogle.js script from pagead2.googlesyndication.com, the adsbygoogle array, ca-pub- publisher IDs and ins.adsbygoogle blocks.