Google Optimize vs UserZoom
Head-to-head usage across the sites we track.
Top sites by authority
Google Optimize · UserZoom · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
18
2
Open Page Rank 8+
130
7
Open Page Rank 7+
409
22
Open Page Rank 6+
723
25
Open Page Rank 5+
1,146
30
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
Google Optimize · UserZoom · share of sites in each country using one or the other
United States
22,776
95
India
13,736
72
United Kingdom
12,439
69
Canada
11,536
71
Germany
10,140
59
France
9,450
59
Brazil
8,989
57
Netherlands
8,660
53
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Google Optimize | UserZoom |
|---|---|---|
| LCP | 2.1 s | 2.4 s |
| INP | 100 ms | 100 ms |
| CLS | 0 | 0 |
| TTFB | 800 ms | 700 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.