PostHog is an open-source product analytics platform used by engineering and product teams who want full control over their user behavior data, session recordings, and feature flag management. Unlike SaaS-only analytics tools, PostHog can be self-hosted or deployed via PostHog Cloud, which means detection signals vary depending on how a given site has implemented it. AIWebsiteDetector's detection engine identifies PostHog installations using 3 distinct script patterns — typically referencing PostHog's CDN-served library or self-hosted JavaScript bundles — alongside 1 HTML pattern that appears in the page markup when the tracker is initialized. These signals are cross-referenced to produce a confident match whether the implementation points to PostHog's managed cloud infrastructure at posthog.com or a custom self-hosted endpoint. The dual deployment model — cloud versus self-hosted — makes PostHog one of the more technically interesting analytics platforms to detect reliably, as the script fingerprints must account for both standardized CDN paths and operator-customized configurations.
Detect PostHog Websites — Free Tool
Enter any URL to check if it was built with PostHog. Instant results, no account required.
How we detect PostHog — see our methodology: AI Influence Score calculation, evidence tiers, and fingerprint signal types.
How to Detect PostHog Websites
Script Patterns
3 patterns
HTML Patterns
1 patterns
1. Check the Page Source
Open the website in your browser, right-click, and select "View Page Source". Search for posthog-specific patterns in the HTML.
2. Look for Script Files
Check the Network tab in DevTools for JavaScript files loaded from PostHog domains.
4. Use AI Website Detector (Easiest)
Our automated scanner checks all these signals at once and gives you an instant confidence score. Just enter any URL above.
Frequently Asked Questions
Is this website built with PostHog?
You can detect if any website was built with PostHog by using our free scanner above. Just enter the URL and we'll analyze HTML patterns, JavaScript files, CDN domains, and HTTP headers to determine if PostHog was used — with a confidence score.
How to detect if a website was built with PostHog?
There are several ways to detect PostHog: (1) View the page source and look for PostHog-specific class names or script URLs, (2) Check the Network tab in DevTools for requests to PostHog CDN domains, (3) Use our free tool — we check 4 detection signals automatically.
What websites are built with PostHog?
PostHog is used by thousands of websites worldwide. Our scanner has detected many PostHog-built sites across different industries. You can scan any URL to check if it uses PostHog.
How accurate is the PostHog detection?
Our PostHog detection engine checks 4 unique fingerprint signals, achieving high confidence results. We score each match and return a confidence percentage so you know how certain the detection is.
About PostHog
PostHog is a leading analytics used by thousands of businesses and developers worldwide. Our detection engine can identify PostHog-built websites with high confidence by analyzing multiple technical signals.
Whether you're a developer doing competitive research, a designer looking for inspiration, or just curious about how a website was built — AI Website Detector gives you instant, accurate detection.
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Detection Info
- Category
- Analytics
- Signals Used
- 4 patterns
- Accuracy
- High
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