A/B testing tools come in various forms, depending on the product type, platform, and objectives. For example, web A/B testing tools enable you to test different versions of a website or web app, such as headlines, images, buttons, and layouts. These tools typically work by inserting a code snippet into the website that allows you to create and run experiments without coding. Popular web A/B testing tools include Google Optimize, Optimizely, and VWO. Mobile A/B testing tools allow you to test different versions of a mobile app, such as icons, menus, screens, and notifications. These tools usually integrate with an app development platform or SDK and let you create and run experiments from a dashboard. Firebase, Leanplum, and Apptimize are some of the most popular mobile A/B testing tools. Lastly, email A/B testing tools enable you to test different versions of your email campaigns, such as subject lines and content. These tools generally integrate with an email marketing platform or service and let you create and run experiments from a dashboard. Mailchimp, Hubspot, and Campaign Monitor are some of the most popular email A/B testing tools.