Adobe Target
591 websites

Adobe Target costs money

https://www.adobe.com/marketing-cloud/target.html

Adobe Target gives marketers the necessary capabilities to continually make their online content and offers more relevant to their customers-yielding greater conversion.

VS

Google Website Optimizer
1,595 websites

Google Website Optimizer is free to use

http://google.com/websiteoptimizer

Website Optimizer is a tool that can help you improve the effectiveness of your website in getting a return on your investment. Page may contain A/B testing.

Market Share by Top Websites

1 Google Website Optimizer is leading in The Entire Web.

2 Adobe Target is leading in Top 10K Sites and Top 100K Sites.

Websites Categories

1 Google Website Optimizer has better usage coverage in more websites categories. Including Games, Community & Society, Science & Education, Pets & Animals and 19 other categories.

2 Adobe Target is leading in Finance.

Geography

1 Google Website Optimizer is leading in most countries, including United States, United Kingdom, Canada, France and 64 other countries.

2 Adobe Target is leading in Japan, India, Switzerland, Sweden and 21 other countries.