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Is This Website Built With PostHog?

Paste any URL below. Our scanner checks 4 PostHog-specific fingerprints — scripts, CDN domains, HTML attributes, and HTTP headers — and returns a confidence score instantly.

How to Tell if a Website Uses PostHog

Identifying whether a website was built with PostHog used to require technical expertise — inspecting source code, tracing network requests in DevTools, and knowing which patterns to look for. Our free scanner automates all of that: it fetches the page, analyzes 4 PostHog-specific signals, and returns a verdict with a confidence score.

You might want to detect PostHog for competitive research, due diligence before acquiring a site, or simple curiosity. Whatever the reason, this page covers every method — automated and manual.

What is PostHog?

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.

It is primarily used for business websites, portfolios, landing pages, and personal sites without coding knowledge.

Visit PostHog official website

Signs a Website Is Built With PostHog

Our detection engine checks 4 unique PostHog fingerprints. Here are the most reliable signals:

High Confidence

JavaScript / Script Files

PostHog loads specific JavaScript runtime files or loads scripts from identifiable URLs. Checking script src attributes reveals the platform.

app.posthog.comeu.posthog.comus.posthog.com
Medium Confidence

HTML Attributes & Class Names

PostHog injects proprietary class names, data attributes, or markup patterns into the page HTML that are unique to the platform.

posthog.init

How to Manually Detect PostHog Websites

Method 1 — View Page Source

  1. Open the website in your browser
  2. Press Ctrl+U (Windows) or Cmd+Option+U (Mac)
  3. Search (Ctrl+F) for posthog or posthog
  4. If found in script src, class names, or meta tags — it's likely PostHog

Method 2 — Browser DevTools Network Tab

  1. Press F12 to open DevTools
  2. Click the Network tab and reload the page
  3. Filter by posthog in the search box
  4. If you see requests to PostHog-specific domains, it's confirmed
Faster: Skip the manual steps — paste the URL into our scanner above and we check all 4 signals in seconds.

How Our PostHog Detector Works

When you submit a URL, our engine fetches the page from its server — just like a browser would — then analyzes the response across 4 PostHog-specific fingerprints:

Script analysis

We scan all loaded JavaScript files for known CDN paths and runtime names

CDN domain matching

We cross-reference every asset request against known platform CDNs

HTML pattern scanning

We search the DOM for platform-specific class names and data attributes

Header inspection

We read HTTP response headers that identify the server or platform

Meta tag extraction

We check generator and other meta tags in the document head

Confidence scoring

We weight each matched signal and normalize to a 0–99% score

How to Build a Similar Website With PostHog

Sign up at https://posthog.com, pick a template, customize it with the drag-and-drop editor, add your content, and publish. Most website builders offer free plans to get started.

Other popular website builders include Wix, Squarespace, Webflow, Carrd, and Showit.

Get started with PostHog

Frequently Asked Questions

How can I tell if a website was built with PostHog?

The most reliable ways to detect PostHog are: (1) open DevTools → Network tab and look for requests to PostHog-specific CDN domains, (2) view page source and search for PostHog-specific class names or data attributes, (3) use our free scanner — we check 4 detection signals automatically and return a confidence score.

Is your PostHog detector free?

Yes, completely free. Paste any URL into our scanner and we'll analyze it for PostHog fingerprints immediately. No account required, no limits on scans.

How accurate is the PostHog detection?

We check 4 unique PostHog fingerprint signals across HTML, JavaScript, CDN domains, meta tags, and HTTP headers. Our confidence score reflects how many signals matched — a score above 70% is a strong indicator. We cap accuracy at 99% to reflect that all fingerprint-based detection is probabilistic.

Can PostHog sites be detected if they use a custom domain?

Yes. Custom domains don't hide the underlying platform. The JavaScript files, CDN requests, HTML attributes, and server headers all remain identifiable regardless of the domain name used. Our scanner fetches the page directly and analyzes its technical composition.

What should I do after detecting a PostHog website?

If you want to build something similar, visit https://posthog.com to learn more or sign up. If you're doing competitive research, our scan result also shows the full technology stack — including hosting platform, domain age, and other detected technologies. You can share the result link with your team.