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
12
Open Page Rank 8+
4
147
Open Page Rank 7+
12
514
Open Page Rank 6+
23
753
Open Page Rank 5+
40
968
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
2,106
1,319
United Kingdom
952
1,231
Canada
787
1,018
India
962
800
Germany
620
979
Australia
688
865
France
590
873
Spain
466
921
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Kiwi Sizing | Piano |
|---|---|---|
| LCP | 1.7 s | 1.7 s |
| INP | 100 ms | 125 ms |
| CLS | 0 | 0.05 |
| TTFB | 500 ms | 600 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.