Websites using React 18+
React is Meta's JavaScript library for building user interfaces; React 18 introduced the createRoot API. About 269,305 websites in the PageSourceSearch index contain the code that reveals it; the 49 highest-ranked are listed below.
How is React 18+ detected?
A site's own bundle mounting a React 18 tree calls createRoot(; library files are not indexed, so the match is the site's code. The discovery keyword is the exact bytes PageSourceSearch looks for in every stored page and script:
createRoot( Search the index for it
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 React 18+
Top 50 websites using React 18+
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 2026-10-04 15:20:27 UTC; the list stopped short of 50 because the search's budget ran out.
How it appears in the source
From forbes.com (js):
jsx)(A,{pendingActionQueue:t})})})});"__next_error__"===document.documentElement.id?i.default.createRoot(R,N).render(r):c.default.startTransition(()=>{i.default.hydrateRoot(R,r,{...N,formState:j})})}(
Questions about finding React 18+
- How does PageSourceSearch know a website uses React 18+?
- By the source itself: A site's own bundle mounting a React 18 tree calls createRoot(; library files are not indexed, so the match is the site's code. 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 React 18+?
- No. The page lists the 50 highest-ranked sites in the index whose source holds the keyword, out of about 269,305 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 React 18+ 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 createRoot( with wp-content/plugins/ lists the WordPress sites that use React 18+.