Cart.js vs core-js
Head-to-head usage across the sites we track.
Top sites by authority
Cart.js · core-js · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
1
242
Open Page Rank 8+
1
5,039
Open Page Rank 7+
1
25,753
Open Page Rank 6+
6
55,778
Open Page Rank 5+
23
106,331
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
Cart.js · core-js · share of sites in each country using one or the other
United States
343
1,295,217
India
101
433,567
Brazil
25
406,300
United Kingdom
137
402,603
Germany
56
384,505
France
47
315,055
Italy
46
302,259
Canada
131
295,823
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Cart.js | core-js |
|---|---|---|
| LCP | 1.5 s | 2 s |
| INP | 75 ms | 75 ms |
| CLS | 0 | 0 |
| TTFB | 500 ms | 800 ms |
Median site's p75 values from the Chrome UX Report, Sep 2026. Lower is better; green meets Google's "good" threshold. This describes the sites that use each technology, not the technology's own overhead.
Sites that switched
Domains that dropped one technology and adopted the other within about a year, data nobody else gives away free.
Cart.js to core-js
| Domain | When |
|---|---|
| hairlocs.com | Jul 2026 |
| melbournemerch.com.au | Jun 2026 |