Google Optimize vs SiteSpect
Head-to-head usage across the sites we track.
Top sites by authority
Google Optimize · SiteSpect · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
18
0
Open Page Rank 8+
124
4
Open Page Rank 7+
382
6
Open Page Rank 6+
669
12
Open Page Rank 5+
1,050
18
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 · SiteSpect · share of sites in each country using one or the other
United States
19,946
825
India
11,864
59
United Kingdom
10,716
59
Canada
9,934
138
Germany
8,787
52
Brazil
7,959
37
France
7,673
53
Netherlands
7,412
50
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Google Optimize | SiteSpect |
|---|---|---|
| LCP | 2.1 s | 1.3 s |
| INP | 100 ms | 125 ms |
| CLS | 0 | 0.05 |
| TTFB | 800 ms | 500 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.