Last updated · refreshes automatically as new data lands.
Looking for an alternative to IIS? Site Stats Database tracks 12 other web servers; the top ones are below, ranked by adoption, with authority and traffic for each and the leading sites that use them. IIS itself is used by 14,679 websites. Back to IIS.
| Web Server | Websites | Share | Median DR | Median traffic | Compare |
|---|---|---|---|---|---|
| IIS (this page) | 14,679 |
| 5.0% |
| 35 |
| 6,306 |
| - |
| Nginx | 133,349 | 45.8% | 25 | 3,984 | IIS vs Nginx |
| Apache | 91,556 | 31.4% | 26 | 3,314 | IIS vs Apache |
| LiteSpeed | 43,161 | 14.8% | 15 | 2,065 | IIS vs LiteSpeed |
| OpenResty | 4,190 | 1.4% | 30 | 3,169 | IIS vs OpenResty |
| Google Web Server | 1,644 | 0.6% | 41 | 5,880 | IIS vs Google Web Server |
| Kestrel | 952 | 0.3% | 23 | 9,622 | IIS vs Kestrel |
| Phusion Passenger | 943 | 0.3% | 32 | 6,327 | IIS vs Phusion Passenger |
| Caddy | 585 | 0.2% | 28 | 2,619 | IIS vs Caddy |
| Tengine | 374 | 0.1% | 63 | 3,668 | IIS vs Tengine |
| Gunicorn | 268 | 0.1% | 44 | 6,313 | IIS vs Gunicorn |
| Cowboy | 217 | 0.1% | 2 | 361 | IIS vs Cowboy |
| Apache Tomcat | 115 | 0.0% | 54 | 3,297 | IIS vs Apache Tomcat |
Nginx is a high-performance web server, reverse proxy, and load balancer.
133,349
Websites
45.8%
Share of Web Server
25
Median DR
3,984
Median traffic
Top sites using Nginx
The Apache HTTP Server is a long-established open-source web server.
91,556
Websites
31.4%
Share of Web Server
26
Median DR
3,314
Median traffic
Top sites using Apache
LiteSpeed is a high-performance commercial web server, popular for WordPress with its caching plugin.
43,161
Websites
14.8%
Share of Web Server
15
Median DR
2,065
Median traffic
Top sites using LiteSpeed
OpenResty is a web platform that bundles Nginx with Lua scripting.
4,190
Websites
1.4%
Share of Web Server
30
Median DR
3,169
Median traffic
Top sites using OpenResty
Google Web Server (GWS) is the front-end web server Google uses for its own properties.
1,644
Websites
0.6%
Share of Web Server
41
Median DR
5,880
Median traffic
Top sites using Google Web Server
Kestrel is the cross-platform web server built into ASP.NET Core.
952
Websites
0.3%
Share of Web Server
23
Median DR
9,622
Median traffic
Top sites using Kestrel
Phusion Passenger is an application server for Ruby, Node.js, and Python apps.
943
Websites
0.3%
Share of Web Server
32
Median DR
6,327
Median traffic
Top sites using Phusion Passenger
Caddy is a modern open-source web server with automatic HTTPS.
585
Websites
0.2%
Share of Web Server
28
Median DR
2,619
Median traffic
Top sites using Caddy
Tengine is a web server originated by Alibaba, based on Nginx.
374
Websites
0.1%
Share of Web Server
63
Median DR
3,668
Median traffic
Top sites using Tengine
Gunicorn is a Python WSGI HTTP server for Unix.
268
Websites
0.1%
Share of Web Server
44
Median DR
6,313
Median traffic
Top sites using Gunicorn
By number of websites, the most widely used alternatives to IIS are Nginx, Apache, LiteSpeed, OpenResty, Google Web Server. The right one depends on your needs; compare them on adoption, authority, and audience above.
Site Stats Database tracks 12 other web servers used by 100 or more websites, plus a long tail of rarer ones. IIS itself is used by 14,679 websites.
Nginx leads this category with 133,349 websites in our catalog.
Adoption is counted from Site Stats Database's own crawl; authority (Ahrefs Domain Rating) and traffic come from Ahrefs and DataForSEO. Everything reflects the sites we track and refreshes at least monthly.
Citation
Site Stats Database. "IIS Alternatives & Competitors." Site Stats Database, July 1, 2026. https://sitestatsdb.com/technologies/web-servers/iis/alternatives
Site Stats Database tracks every web server with full monthly traffic history, authority, keywords, referring domains, and the complete detected tech stack. Filter, compare, and export the data.
See plans & pricing