Websites using React 18+
React is Meta's JavaScript library for building user interfaces; React 18 introduced the createRoot API. About 172,781 websites in the PageSourceSearch index contain the code that reveals it; the 50 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 2026-09-29 18:59:40 UTC.
How it appears in the source
From microsoft.com (js):
UHin.js").then((i) => i.M) // Your React component ]); this.reactRoot = t.createRoot(this), this.reactRoot.render(s.createElement(e, { extensibleLinks: this.extensibleLinks, signIn
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 172,781 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+.