Cowboy vs IIS
Head-to-head usage across the sites we track.
Top sites by authority
Cowboy · IIS · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
0
52
Open Page Rank 8+
12
1,251
Open Page Rank 7+
22
4,898
Open Page Rank 6+
36
9,357
Open Page Rank 5+
51
15,639
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
Cowboy · IIS · share of sites in each country using one or the other
United States
3,151
117,730
India
1,475
58,829
United Kingdom
1,495
42,820
Italy
1,004
40,808
Brazil
2,305
34,656
Canada
1,369
31,601
Germany
1,133
31,200
Türkiye
623
31,246
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Cowboy | IIS |
|---|---|---|
| LCP | 1.9 s | 1.7 s |
| INP | 75 ms | 75 ms |
| CLS | 0 | 0 |
| TTFB | 700 ms | 700 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.
Cowboy to IIS
| Domain | When |
|---|---|
| veezu.co.uk | May 2026 |