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+
16
2
Open Page Rank 8+
118
6
Open Page Rank 7+
367
21
Open Page Rank 6+
643
23
Open Page Rank 5+
1,012
28
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
19,616
83
India
11,660
64
United Kingdom
10,689
60
Canada
9,812
59
Germany
8,571
51
Brazil
7,844
48
France
7,579
48
Spain
7,482
52
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Google Optimize | UserZoom |
|---|---|---|
| LCP | 2 s | 2.1 s |
| INP | 100 ms | 125 ms |
| CLS | 0 | 0 |
| TTFB | 800 ms | 800 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.