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+
15
0
Open Page Rank 8+
112
4
Open Page Rank 7+
356
7
Open Page Rank 6+
620
13
Open Page Rank 5+
982
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
19,616
876
India
11,660
59
United Kingdom
10,689
59
Canada
9,812
129
Germany
8,571
49
Brazil
7,844
35
France
7,579
49
Spain
7,482
51
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Google Optimize | SiteSpect |
|---|---|---|
| LCP | 2 s | 1.3 s |
| INP | 100 ms | 100 ms |
| CLS | 0 | 0.05 |
| TTFB | 800 ms | 500 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.