Boa vs IIS
Head-to-head usage across the sites we track.
Detections for Boa end in Jan 2021. The fingerprint catalog behind our crawls no longer carries that technology as its own entry, usually because it was retired or split into more specific ones, so its figure is the last recorded and is not directly comparable with a currently tracked technology.
Top sites by authority
Boa · IIS · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
Boa · IIS · share of sites in each country using one or the other
United States
0
121,069
India
0
60,068
United Kingdom
0
43,214
Italy
0
39,691
Brazil
0
35,276
Germany
0
31,791
Canada
0
31,780
Türkiye
0
31,323
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Boa | IIS |
|---|---|---|
| LCP | 0.9 s | 1.6 s |
| INP | 0 ms | 75 ms |
| CLS | 0 | 0 |
| TTFB | 600 ms | 700 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.