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+
52
11
Open Page Rank 8+
1,251
55
Open Page Rank 7+
4,898
136
Open Page Rank 6+
9,357
209
Open Page Rank 5+
15,639
293
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
117,730
2,983
India
58,829
1,724
United Kingdom
42,820
1,519
Italy
40,808
1,008
Brazil
34,656
993
Canada
31,601
1,369
Germany
31,200
1,255
Türkiye
31,246
790
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | IIS | Microsoft HTTPAPI |
|---|---|---|
| LCP | 1.7 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.