Apache Tomcat vs IIS
Head-to-head usage across the sites we track.
Top sites by authority
Apache Tomcat · IIS · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
29
53
Open Page Rank 8+
310
1,275
Open Page Rank 7+
907
5,011
Open Page Rank 6+
1,523
9,561
Open Page Rank 5+
2,185
15,981
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
Apache Tomcat · IIS · share of sites in each country using one or the other
United States
10,265
121,069
India
5,492
60,068
United Kingdom
4,396
43,214
Italy
3,981
39,691
Brazil
3,965
35,276
Germany
4,572
31,791
Canada
3,813
31,780
Türkiye
2,318
31,323
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Apache Tomcat | IIS |
|---|---|---|
| LCP | 1.7 s | 1.6 s |
| INP | 75 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.
Sites that switched
Domains that dropped one technology and adopted the other within about a year, data nobody else gives away free.
Apache Tomcat to IIS
| Domain | When |
|---|---|
| ansanart.com | Jan 2026 |
| ikki.digital | Sep 2025 |
IIS to Apache Tomcat
| Domain | When |
|---|---|
| cmenergyshipping.com | Aug 2026 |
| laoliva.es | Dec 2025 |
| maua.sp.gov.br | Dec 2025 |
| spaghettihouse.com | Dec 2025 |