Technology report · JavaScript library
core-js usage report
core-js, a JavaScript library, was detected on 134 of the 66086 websites scanned, a share of 0.2%. Data is dated 2026-10-28. Nonprofits are the largest industry group among sites with a known industry, and React is the technology most often found next to it. No version information was captured.
- 134websites using it
- 0.2%of 66,086 scanned websites with a detected technology
- 2026-10-28data date
Industry data covers only 38 sites where the industry is known, so these percentages rest on small counts. Nonprofits lead with 18.4% (7 sites), followed by Education at 13.2% (5 sites) and E-commerce and retail at 10.5% (4 sites). Gaming and News and media each hold 7.9% (3 sites). Treat this as a rough guide to where core-js turns up, not a precise ranking.
Among the sites running core-js, React is the most common companion at 67.2% (90 sites). Sentry and Wix each appear on 63.4% (85 sites), and Lodash on 62.7% (84 sites). Cloudflare is present on 49.3% (66 sites) and Google Tag Manager on 33.6% (45 sites). PHP shows up on 15.7% (21 sites) and Google Fonts on 14.9% (20 sites).
Version detail is missing: the count of sites with an identified core-js version is 0, so the page cannot say which releases are in use. Example sites where the library was found include khadas.com, cipriani.com, kalypsomedia.com, iriworldwide.com and hirezstudios.com. Use this page to see what core-js is typically deployed alongside, not to audit versions.
Industries using core-js
| Industry | Websites | Share of 38 classified |
|---|---|---|
| Nonprofits | 7 | 18.4% |
| Education | 5 | 13.2% |
| E-commerce and retail | 4 | 10.5% |
| Gaming | 3 | 7.9% |
| News and media | 3 | 7.9% |
Technologies used together with core-js
| Technology | Websites | Share of core-js sites |
|---|---|---|
| React | 90 | 67.2% |
| Sentry | 85 | 63.4% |
| Wix | 85 | 63.4% |
| Lodash | 84 | 62.7% |
| Cloudflare | 66 | 49.3% |
| Google Tag Manager | 45 | 33.6% |
| PHP | 21 | 15.7% |
| Google Fonts | 20 | 14.9% |
Example company websites
khadas.com, cipriani.com, kalypsomedia.com, iriworldwide.com, hirezstudios.com
FAQ
- How many websites use core-js?
- core-js was detected on 134 of the 66086 websites scanned, which is a share of 0.2%. The figures reflect the scan dated 2026-10-28 and cover only the sites we scanned, not the whole web.
- Which industries use core-js most?
- Among 38 sites with a known industry, Nonprofits lead at 18.4% (7 sites). Education follows at 13.2% (5 sites), then E-commerce and retail at 10.5% (4 sites). Gaming and News and media each have 7.9% (3 sites).
- What technologies are commonly used alongside core-js?
- React is found most often with core-js, on 67.2% of these sites (90 sites). Sentry and Wix each appear on 63.4% (85 sites), Lodash on 62.7% (84 sites), and Cloudflare on 49.3% (66 sites).
- Which versions of core-js are most common?
- This cannot be answered from the data. The number of sites with a detected core-js version is 0, and no version list was recorded, so release usage is unknown for this scan.
- Which sites were found using core-js?
- Examples from the scan include khadas.com, cipriani.com, kalypsomedia.com, iriworldwide.com and hirezstudios.com. These are only samples of the 134 sites where core-js was detected, not a complete list.
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