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
61
Open Page Rank 8+
330
1,315
Open Page Rank 7+
953
5,213
Open Page Rank 6+
1,597
9,906
Open Page Rank 5+
2,307
16,556
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
11,487
136,825
India
6,226
68,343
United Kingdom
4,955
49,161
Italy
4,670
46,831
Brazil
4,396
38,951
Germany
5,371
36,200
Canada
4,394
36,284
Türkiye
2,615
36,724
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 | 700 ms | 700 ms |
Median site's p75 values from the Chrome UX Report, Jun 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 |
|---|---|
| laoliva.es | Dec 2025 |
| maua.sp.gov.br | Dec 2025 |
| spaghettihouse.com | Dec 2025 |