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
243
Open Page Rank 8+
1
5,081
Open Page Rank 7+
1
26,045
Open Page Rank 6+
6
56,582
Open Page Rank 5+
24
107,942
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
352
1,320,418
India
104
439,882
Brazil
26
411,231
United Kingdom
139
404,005
Germany
60
391,462
France
54
311,727
Canada
142
298,167
Italy
46
291,018
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Cart.js | core-js |
|---|---|---|
| LCP | 1.6 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, Aug 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 |