posthog-js is an npm package; the sites listed here load it from the jsDelivr CDN, where it is among the most requested packages.
106 websites in the PageSourceSearch index contain the code that reveals it; the 50 highest-ranked are listed below.
How is posthog-js (npm) detected?
A page loading posthog-js from jsDelivr references cdn.jsdelivr.net/npm/posthog-js followed by a version or a path. The discovery keyword is the exact bytes PageSourceSearch looks for in every stored page and script:
A literal is matched byte for byte, case-sensitively. Combine it with another keyword, a domain, a kind or a date filter on the search page to narrow the list. About posthog-js (npm)
Top 50 websites using posthog-js (npm)
Ranked by the domain's position in the crawl's ranked list (Common Crawl harmonic centrality), highest first. view source opens the stored page or script with the match highlighted. Computed 2026-09-30 12:22:52 UTC.
How does PageSourceSearch know a website uses posthog-js (npm)?
By the source itself: A page loading posthog-js from jsDelivr references cdn.jsdelivr.net/npm/posthog-js followed by a version or a path. PageSourceSearch stores the raw HTML and first-party JavaScript of each crawled site and matches the keyword byte for byte, so every listed site's stored source contains it.
Is this a complete list of websites using posthog-js (npm)?
No. The page lists the 50 highest-ranked sites in the index whose source holds the keyword, out of 106 websites that do; the count is the index's estimate at the time the list was computed. Run the keyword as a search to page through all of them, or add a kind or date filter.
How do I find websites that use posthog-js (npm) together with another technology?
Search for both keywords at once: several terms separated by spaces must all be found on the same site, or with the Same page toggle in the same page. For example cdn\.jsdelivr\.net/npm/posthog\-js[@/] with wp-content/plugins/ lists the WordPress sites that use posthog-js (npm).