Adobe Visitor API
94,784 websites

Adobe Visitor API costs money

https://marketing.adobe.com/developer/documentation/data-insertion/c-visitor-id

Visitor Identification api by Adobe

VS

Piwik
339,453 websites

Piwik offers both free and paid options

http://piwik.org

Piwik is an open source analytics platform currently used by individuals, companies and governments all over the world. With Piwik, your data will always be yours. Learn why Piwik is the right web analytics tool for you below.

Market Share by Top Websites

1 Piwik is leading in Top 100K Sites, Top 1M Sites and The Entire Web.

2 Adobe Visitor API is leading in Top 10K Sites.

Websites Categories

1 Piwik has better usage coverage in more websites categories. Including Science & Education, Computers Electronics & Technology, Law & Government, Health and 18 other categories.

2 Adobe Visitor API is leading in Vehicles and Finance.

Geography

1 Piwik is leading in most countries, including Germany, United States, France, Japan and 160 other countries.

2 Adobe Visitor API hasn't got a lead over Piwik in any country.