Optimizely vs SiteSpect
Head-to-head usage across the sites we track.
Top sites by authority
Optimizely · SiteSpect · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
32
0
Open Page Rank 8+
398
4
Open Page Rank 7+
1,140
7
Open Page Rank 6+
1,815
13
Open Page Rank 5+
2,633
18
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
Optimizely · SiteSpect · share of sites in each country using one or the other
United States
25,713
876
Canada
6,439
129
India
5,059
59
United Kingdom
4,863
59
Australia
4,155
38
Germany
3,558
49
France
3,449
49
Spain
3,393
51
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Optimizely | SiteSpect |
|---|---|---|
| LCP | 1.9 s | 1.3 s |
| INP | 100 ms | 100 ms |
| CLS | 0.05 | 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.
Sites that switched
Domains that dropped one technology and adopted the other within about a year, data nobody else gives away free.
SiteSpect to Optimizely
| Domain | When |
|---|---|
| florsheim.com | Sep 2026 |