Citrix NetScaler
43,573 websites

Citrix NetScaler offers both free and paid options

http://www.citrix.com/products/netscaler-application-delivery-controller/overview.html

Citrix NetScaler is an all-in-one web application delivery controller that makes applications run five times better, reduces web application ownership costs, and makes sure that applications are always available. It is deployed in thousand...

VS

IBM Websphere Application Server
147 websites

IBM Websphere Application Server costs money

http://www-03.ibm.com/software/products/en/appserv-was

Build, deploy and manage robust, agile and reusable SOA business applications and services of all types while reducing application infrastructure costs with IBM WebSphere Application Server.

Market Share by Top Websites

1 Citrix NetScaler is leading in Top 10K Sites, Top 100K Sites, Top 1M Sites and The Entire Web.

2 In terms of market share, IBM Websphere Application Server is clearly lagging behind, losing to Citrix NetScaler in all segments.

Websites Categories

1 Citrix NetScaler has better usage coverage in more websites categories. Including Science & Education, Finance, Computers Electronics & Technology, Health and 20 other categories.

2 IBM Websphere Application Server hasn't got a lead over Citrix NetScaler in any websites category.

Geography

1 Citrix NetScaler is leading in most countries, including United States, Japan, China, Turkey and 147 other countries.

2 IBM Websphere Application Server hasn't got a lead over Citrix NetScaler in any country.