How to know if any website is using Google Website optimizer for A/B testing? By viewing a source code. For what to look into view source which confirms that site is using Google Website optimizer

1 Answer 1


Look for the _utmx cookie for the site in question.

From Google

You can use Google Analytics with Google Website Optimizer (GWO), which is a tool that helps determine the most effective design for your site. When a website optimizer script executes on your page, a _utmx cookie is written to the browser and its value is sent to Google Analytics. See the Website Optimizer Help Center for more information.


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Not the answer you're looking for? Browse other questions tagged or ask your own question.