Unfortunately, this application is no longer available as of September 2023.
Google Optimize is a great free A/B testing tool, allowing you to easily test and measure changes to your site. It integrates seamlessly with Google Analytics, so you can see your experiment test results either in the Google Optimize admin panel, or right in your Google Analytics property.
Google Optimize also allows personalizing elements of your site/pages, to improve conversion rates. This can be especially effective for Google Ads campaigns.