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Client-side refers to where software (e.g. A/B testing tools) runs in the visitor’s web browser after the page has loaded. For example client-side A/B testing software uses a line of JavaScript code to manipulate a page in your browser.

Image of client-side and server-side

Client-side and server-side

Client-side A/B testing software has the advantage it allows you to set up tests quickly, with no need to go through IT or involve developers and most offer a What You See Is What You Get (WYSIWG) visual editor which means you can build your own tests without any technical know-how. On the downside because client-side software makes changes after the page has loaded it can suffer from a flicker in the browser. See also server-side.


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