Site Kit vs Zipkin
Head-to-head usage across the sites we track.
Top sites by authority
Site Kit · Zipkin · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
39
7
Open Page Rank 8+
636
32
Open Page Rank 7+
2,691
92
Open Page Rank 6+
5,912
149
Open Page Rank 5+
12,410
202
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
Site Kit · Zipkin · share of sites in each country using one or the other
United States
194,442
765
India
96,669
411
Japan
73,684
301
Brazil
73,670
281
United Kingdom
63,934
481
France
62,421
499
Spain
58,678
592
Italy
55,218
401
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Site Kit | Zipkin |
|---|---|---|
| LCP | 2.4 s | 2.1 s |
| INP | 75 ms | 75 ms |
| CLS | 0 | 0.05 |
| TTFB | 1300 ms | 1000 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.
Sites that switched
Domains that dropped one technology and adopted the other within about a year, data nobody else gives away free.
Zipkin to Site Kit
| Domain | When |
|---|---|
| velocidadcuchara.com | Apr 2026 |