IIS vs Microsoft HTTPAPI
Head-to-head usage across the sites we track.
Top sites by authority
IIS · Microsoft HTTPAPI · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
53
12
Open Page Rank 8+
1,275
56
Open Page Rank 7+
5,011
137
Open Page Rank 6+
9,561
210
Open Page Rank 5+
15,981
295
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
IIS · Microsoft HTTPAPI · share of sites in each country using one or the other
United States
121,069
2,957
India
60,068
1,718
United Kingdom
43,214
1,481
Italy
39,691
988
Brazil
35,276
991
Canada
31,780
1,367
Germany
31,791
1,269
Türkiye
31,323
777
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | IIS | Microsoft HTTPAPI |
|---|---|---|
| LCP | 1.6 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, 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.