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+
36
7
Open Page Rank 8+
649
34
Open Page Rank 7+
2,698
94
Open Page Rank 6+
5,893
152
Open Page Rank 5+
12,351
212
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
215,676
858
India
110,602
461
Japan
82,773
328
Brazil
80,295
320
France
74,632
554
United Kingdom
72,179
537
Spain
67,753
654
Italy
63,679
444
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Site Kit | Zipkin |
|---|---|---|
| LCP | 2.4 s | 2.2 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, 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.
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 |