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+
30
52
Open Page Rank 8+
306
1,251
Open Page Rank 7+
896
4,898
Open Page Rank 6+
1,475
9,357
Open Page Rank 5+
2,101
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
Apache Tomcat · IIS · share of sites in each country using one or the other
United States
9,834
117,730
India
5,504
58,829
United Kingdom
4,441
42,820
Italy
4,080
40,808
Brazil
3,999
34,656
Germany
4,566
31,200
Canada
3,866
31,601
Türkiye
2,293
31,246
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Apache Tomcat | IIS |
|---|---|---|
| LCP | 1.7 s | 1.7 s |
| INP | 75 ms | 75 ms |
| CLS | 0 | 0 |
| TTFB | 600 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.
Apache Tomcat to IIS
| Domain | When |
|---|---|
| ansanart.com | Jan 2026 |
IIS to Apache Tomcat
| Domain | When |
|---|---|
| cmenergyshipping.com | Aug 2026 |
| laoliva.es | Dec 2025 |
| maua.sp.gov.br | Dec 2025 |
| spaghettihouse.com | Dec 2025 |