Last updated · traffic data through Jun 2026 - refreshes automatically as new data lands.
core-js is the most widely used JavaScript standard-library polyfill set. Official site
255,936
Websites
53%
Share of JS Library
#2
Rank
of 86
23
Median DR
8,858,214,652
Combined monthly traffic
Showing 12 of 255,936 results
255,924 more core-js sites are hidden. Unlock the full list.
Site Stats Database tracks 255,936 websites using core-js. They carry a median Ahrefs Domain Rating of 23, lower than the 28 median across all tracked sites. The typical one is about 12 years old and ranks for 858 organic keywords. Over the last 2 months, the number we track grew 38% and their combined traffic rose 9.1%. Notable core-js sites include netflix.com, bestbuy.com, harvard.edu. See plans and pricing.
Every figure in this section is based only on the websites Site Stats Database tracks, not the entire web. Market share, rank, totals, and medians all reflect our sample of 486,022 sites using a JavaScript library, not global market data.
+70,795 (+38%)
2026-06 → 2026-07
29.1% of tracked sites (was 31.1%)
Category
Top market
Top industry
Median referring domains
286
Median keywords
858
Median domain age
12 yrs
Adoption by audience size
Share of the most-visited sites we track that are websites using core-js.
9.0%
Top 10K
904 of 10,000
20%
Top 100K
19,724 of 100,000
29%
All tracked
255,936 of 880,858
Monthly snapshots of the sites in this segment. A new point is added every month. Website counts move when our catalog grows; the share of tracked sites is normalized, so it only moves when the prevalence of this segment changes.
Websites
255,936
2026-06 to 2026-07
Share of tracked sites
29.1%
2026-06 to 2026-07
Combined monthly traffic
8,858,214,652
2026-06 to 2026-07
Median page count
308
2026-06 to 2026-07
Median referring domains
286
2026-06 to 2026-07
The technologies most often detected alongside core-js.
Site Stats Database tracks 255,936 websites using core-js, enriched with full monthly traffic history, authority, keywords, referring domains, and the complete detected tech stack. We detect core-js by crawling each site's HTML, response headers, and DNS; traffic and SEO metrics come from DataForSEO and Ahrefs. Everything refreshes at least monthly.
See plans & pricingcore-js is a JavaScript library. Site Stats Database detects it on the websites it tracks by analyzing each site's homepage, response headers, and DNS, and has currently found it on 255,936 websites.
Site Stats Database currently tracks 255,936 websites using core-js. That makes it the #2 most common js library out of 86 we detect in this category.
The most common are News, Repair, and Travel sites, and they are most common in United States and Spain. The breakdowns above show the full split across topics, markets, authority, and monetization, based on the 255,936 websites using core-js we track.
core-js is one of 86 javascript libraries Site Stats Database detects. Browse the JavaScript Libraries category page for the full list ranked by usage. Because these serve many different purposes, we do not pit them head-to-head.
They tend to have lower authority than the typical website: the median core-js site has an Ahrefs Domain Rating of 23, lower than the 28 median across all sites Site Stats Database tracks.
Over the last 2 months, the number we track grew 38% and their combined traffic rose 9.1%, based on Site Stats Database's month-by-month snapshots of this group.
Traffic estimates, organic keywords, and authority come from DataForSEO; Domain Rating comes from Ahrefs' public endpoint; and technology detection (including core-js) comes from Site Stats Database's own crawler, which inspects each site's HTML, headers, and infrastructure.
At least monthly. Traffic and rankings refresh every month, and technology detections are refreshed as sites are re-crawled, so this page always reflects the current 255,936 core-js websites.
Yes. The complete, filterable list of all 255,936 core-js websites, enriched with traffic history, authority, keywords, and the full tech stack, is available with a Site Stats Database plan.
Site Stats Database detects core-js by crawling each site's homepage HTML, response headers, and DNS.
Citation
Site Stats Database. "Websites Using core-js." Site Stats Database, July 1, 2026. https://sitestatsdb.com/technologies/javascript-libraries/core-js
| English |
| 89 |
| 3,771,049 |
| 112,318 |
| 32 yrs |
| 127,973,459 |
| core-js |
| harvard.edu | English | 93 | 3,845,102 | 714,396 | 41 yrs | 104,117,233 | core-js |
| primevideo.com | English | 89 | 2,309,125 | 67,989 | 25 yrs | 63,079,286 | core-js |
| recipetineats.com | English | 79 | 844,549 | 59,630 | 12 yrs | 55,020,972 | core-js |
| loveandlemons.com | English | 80 | 566,210 | 32,708 | 14 yrs | 50,996,712 | core-js |
| flashscoreusa.com | English | 52 | 356,383 | 3,873 | 2 yrs | 49,180,366 | core-js |
| stanford.edu | English | 92 | 1,198,840 | 511,286 | 40 yrs | 45,915,915 | core-js |
| foodnetwork.com | English | 90 | 2,320,576 | 180,804 | 30 yrs | 44,602,039 | core-js |
| sallysbakingaddiction.com | English | 81 | 480,328 | 57,847 | 14 yrs | 40,742,191 | core-js |
| science.nasa.gov | English | 92 | 363,399 | 84,196 | 28 yrs | 37,250,885 | core-js |
| renehersecycles.com | English | 55 | 4,750 | 2,428 | 8 yrs | 36,665,303 | core-js |