---
title: "How Is Client-Side A/B Testing Different from Server-Side?"
url: https://fibr.ai/faq/what-s-the-difference-between-client-side-and-server-side-a-b-testing-for-shopify
description: "With Fibr, achieve seamless web personalization and build landing pages at scale that align perfectly with the messaging that brings visitors to your site."
last_updated: 2026-05-05T11:52:48.076311+00:00
---
Client-side A/B testing for Shopify executes experiments directly in the user's browser using JavaScript. It focuses on the front-end aspects visible to users such as content and appearance of the page, ensuring the user interface is intuitive and bug free. Server-side A/B testing is a more back-end process. It involves experimenting outside of the user's interface. The server generates and serves the variations directly. Before the page is rendered, the server determines which variation a user sees.