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+
124
7
Open Page Rank 7+
382
22
Open Page Rank 6+
669
24
Open Page Rank 5+
1,050
29
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
19,946
82
India
11,864
68
United Kingdom
10,716
62
Canada
9,934
63
Germany
8,787
47
Brazil
7,959
47
France
7,673
48
Netherlands
7,412
42
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Google Optimize | UserZoom |
|---|---|---|
| LCP | 2.1 s | 2.1 s |
| INP | 100 ms | 100 ms |
| CLS | 0 | 0 |
| TTFB | 800 ms | 700 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.