ExpressionEngine
9,943 websites

ExpressionEngine offers both free and paid options

expressionengine.com

ExpressionEngine is a flexible, feature-rich content management platform that empowers hundreds of thousands of individuals and organizations around the world to easily manage their web site.

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Zendesk Knowledge Base
19,041 websites

Zendesk Knowledge Base costs money

https://www.zendesk.com/guide/features/knowledge-base-software/

Zendesk Knowledge Base allows you to create, organize, and share content easily with agents, select customers, or the public and measure what performs best.

Market Share by Top Websites

1 Zendesk Knowledge Base is leading in Top 10K Sites and The Entire Web.

2 ExpressionEngine is leading in Top 100K Sites and Top 1M Sites.

Websites Categories

1 Zendesk Knowledge Base has better usage coverage in more websites categories. Including Computers Electronics & Technology, Finance, Business & Consumer Services, Lifestyle and 17 other categories.

2 ExpressionEngine is leading in Law & Government, Heavy Industry & Engineering and News & Media.

Geography

1 Zendesk Knowledge Base is leading in most countries, including United States, Japan, Germany, Australia and 98 other countries.

2 ExpressionEngine is leading in United Kingdom, Canada, Croatia, Netherlands and 36 other countries.