May 2021 Web Server Survey

In the May 2021 survey, we received responses from 1,218,423,991 websites on 259,596,021 unique domains and 11,051,830 computers with web contact. This equates to an increase of 6.28 million sites and 112,000 computers, but a loss of 4.87 million domains.

nginx won the most hostnames, active sites, and computers this month. but also suffered the largest loss of 4.73 million domains. The most notable increase was 78,900 computers (+ 2.03%), bringing its top share to 36.0%. It continues to lead the way in hostname and domain metrics, while Apache leads the way in active sites.

Apache also claims its lead among the top million websites with a 25.4% share compared to nginx’s 22.9%. Cloudflare’s share of the top million sites is now 17.0% after adding an additional 3,090 sites to its presence, and Microsoft added 1,840 sites to bring its share to 6.85%.

OpenResty saw the biggest drop of 8.10 million hostnames (-9.88%), which reduced its market share to 6.06% (-0.7 PP). Microsoft also suffered a huge loss of 6.92 million sites (-10.3%), which reduced its share to 4.95% (-0.6 pp).

One of the most famous users of OpenResty is Automattic, which serves millions of Tumblr microblogging websites located under the tumblr.com domain – for example, icontherecord.tumblr.com.

Automattic is also responsible for the popular blogging service WordPress.com, where it instead uses nginx to serve millions of blogs. These WordPress-based websites can either use custom domain names or free blogs can be created directly under the wordpress.com domain – for example catsbeingcats.wordpress.com.

The underlying blogging software WordPress celebrated its 18th birthday this month. Automattic continues to contribute to this open source project, and the software is available for free on wordpress.org so anyone can download the software and install it on other compatible web server platforms. Although Apache and nginx are recommended, any server that supports PHP and MySQL should be able to run a WordPress site. WordPress is so popular that some hosting providers also offer one-click installers and other tools that make WordPress sites easy to manage.

News about other providers and hosting

  • nginx 1.20.1 stable and nginx 1.21.0 mainline were released on May 25th. Both versions contain a fix for a 1-byte memory overwrite vulnerability.
  • NGINX Unit 1.24.0 was released on May 27th. This adds several new features including SSL / TLS configuration commands, static file chrooting with symlink and mount resolution controls, static file filtering by MIME type, and compatibility with Ruby 3.0. It also contains some bug fixes.
  • Caddy 2.4.0 was released on May 10th with over 110 patches to fix bugs and add features like remote API access, automated identity management, and dynamic configuration loading.
  • Apache Tomcat 10.0.6, 9.0.46, and 8.5.66 were released on May 12th. Version 1.0.0 of the Apache Tomcat Migration Tool for Jakarta EE was released a few days earlier on May 7th – this is the tool that allows Tomcat web applications written in Java EE 8 to be automatically converted to Tomcat 10 to be executed that Jakarta EE implements 9.
  • To showcase its new architectural paradigm of Workers, WebSockets and Durable Objects, Cloudflare released a multiplayer Doom port that can be played at https://silentspacemarine.com. This game shows how application code can run on Cloudflare edge nodes rather than just a client or server.

Web server market share

developer April 2021 percent May 2021 percent change
nginx 432.167.302 35.65% 440.997.336 36.19% 0.54
Apache 313,948,741 25.90% 314,774,492 25.83% -0.07
OpenResty 81.935.391 6.76% 73.839.970 6.06% -0.70
Microsoft 67.182.740 5.54% 60.265.118 4.95% -0.60

Web server market share for active sites

developer April 2021 percent May 2021 percent change
Apache 50,508,693 25.34% 50.284.331 25.20% -0.14
nginx 39.965.809 20.05% 40,735,597 20.41% 0.36
Google 19,438,838 9.75% 18,772,626 9.41% -0.35
Cloud flare 17,677,430 8.87% 17,045,450 8.54% -0.33

See Active Sites for more information

Web server market share for the millions of busiest websites

developer April 2021 percent May 2021 percent change
Apache 254.934 25.49% 254.358 25.44% -0.06
nginx 228,587 22.86% 228,709 22.87% 0.01
Cloud flare 166,956 16.70% 170,042 17.00% 0.31
Microsoft 66,687 6.67% 68,524 6.85% 0.18

Web server market share for computers

developer April 2021 percent May 2021 percent change
nginx 3,897,150 35.62% 3,976,094 35.98% 0.35
Apache 3,533,152 32.30% 3,534,563 31.98% -0.32
Microsoft 1,428,374 13.06% 1,414,160 12.80% -0.26

Web server market share for domains

developer April 2021 percent May 2021 percent change
nginx 80,516,546 30.44% 75,782,888 29.19% -1.25
Apache 69.248.336 26.18% 68,788,737 26.50% 0.31
OpenResty 38,502,619 14.56% 37.501.804 14.45% -0.11
Cloud flare 18,591,275 7.03% 19,083,700 7.35% 0.32

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