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+
38
8
Open Page Rank 8+
649
34
Open Page Rank 7+
2,684
92
Open Page Rank 6+
5,882
150
Open Page Rank 5+
12,397
199
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
191,744
754
India
94,995
417
Japan
73,790
297
Brazil
71,181
288
United Kingdom
64,452
471
France
63,629
496
Spain
63,132
597
Italy
58,351
405
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, Sep 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 |
|---|---|
| graphicsurfwear.com | Sep 2026 |
| velocidadcuchara.com | Apr 2026 |