Kiwi Sizing vs Piano
Head-to-head usage across the sites we track.
Top sites by authority
Kiwi Sizing · Piano · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
3
13
Open Page Rank 8+
4
141
Open Page Rank 7+
12
501
Open Page Rank 6+
23
732
Open Page Rank 5+
38
945
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 · Piano · share of sites in each country using one or the other
United States
1,986
1,376
United Kingdom
921
1,279
Canada
763
1,015
India
901
812
Germany
590
963
Australia
632
907
Spain
484
970
France
564
849
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Kiwi Sizing | Piano |
|---|---|---|
| LCP | 1.6 s | 1.8 s |
| INP | 100 ms | 125 ms |
| CLS | 0 | 0.05 |
| TTFB | 500 ms | 700 ms |
Median site's p75 values from the Chrome UX Report, Oct 2026. Lower is better; green meets Google's "good" threshold. This describes the sites that use each technology, not the technology's own overhead.