Kiwi Sizing vs Retail Rocket
Head-to-head usage across the sites we track.
Top sites by authority
Kiwi Sizing · Retail Rocket · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
3
0
Open Page Rank 8+
4
2
Open Page Rank 7+
12
6
Open Page Rank 6+
23
11
Open Page Rank 5+
38
20
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
Kiwi Sizing · Retail Rocket · share of sites in each country using one or the other
United States
2,036
241
United Kingdom
925
167
India
947
64
Germany
594
260
Canada
768
47
France
571
143
Australia
645
47
Spain
474
158
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Kiwi Sizing | Retail Rocket |
|---|---|---|
| LCP | 1.7 s | 2.1 s |
| INP | 100 ms | 125 ms |
| CLS | 0 | 0 |
| TTFB | 500 ms | 1000 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.