Kiwi Sizing vs Virtusize
Head-to-head usage across the sites we track.
Top sites by authority
Kiwi Sizing · Virtusize · 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
0
Open Page Rank 7+
12
0
Open Page Rank 6+
23
0
Open Page Rank 5+
38
0
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 · Virtusize · share of sites in each country using one or the other
United States
2,036
2
India
947
2
United Kingdom
925
2
Canada
768
2
Australia
645
2
Germany
594
2
France
571
2
Italy
507
2
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Kiwi Sizing | Virtusize |
|---|---|---|
| LCP | 1.7 s | 1.5 s |
| INP | 100 ms | 137 ms |
| CLS | 0 | 0 |
| TTFB | 500 ms | 500 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.