Cart Functionality vs GrocerKey
Head-to-head usage across the sites we track.
Top sites by authority
Cart Functionality · GrocerKey · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
141
0
Open Page Rank 8+
2,475
0
Open Page Rank 7+
10,181
0
Open Page Rank 6+
20,237
0
Open Page Rank 5+
36,858
1
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
Cart Functionality · GrocerKey · share of sites in each country using one or the other
United States
729,127
144
United Kingdom
237,218
0
India
207,181
2
Germany
193,696
0
France
180,639
0
Canada
165,082
2
Brazil
144,613
0
Spain
143,412
0
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Cart Functionality | GrocerKey |
|---|---|---|
| LCP | 1.7 s | 2 s |
| INP | 75 ms | 100 ms |
| CLS | 0 | 0 |
| TTFB | 700 ms | 950 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.