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+
4
12
Open Page Rank 8+
6
145
Open Page Rank 7+
14
495
Open Page Rank 6+
24
732
Open Page Rank 5+
40
952
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
2,456
1,465
United Kingdom
1,161
1,344
India
1,134
882
Canada
927
1,089
Germany
735
1,065
Australia
765
926
France
712
969
Spain
501
1,030
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, Jun 2026. Lower is better; green meets Google's "good" threshold. This describes the sites that use each technology, not the technology's own overhead.