Best A/B Testing Tool for React (2025)

React powers millions of web apps. But A/B testing in React can be complex — component lifecycles, virtual DOM updates, and state management create unique challenges. ExperimentHQ solves them all, making it the #1 A/B testing tool for React.

The A/B Testing Challenge in React

Traditional A/B testing tools weren't built for React. They cause problems:

⚠️ Flicker Issues

DOM changes after React renders cause visual jumps

⚠️ SDK Complexity

Most tools require SDK integration and context providers

⚠️ Bundle Size

Heavy SDKs increase your JavaScript bundle

⚠️ Re-render Issues

Changes can trigger unnecessary re-renders

ExperimentHQ solves all of these. Our lightweight script loads before React and applies changes at the DOM level — no SDK, no bundle bloat, no flicker.

Why ExperimentHQ is Perfect for React

Zero Flicker

Tests apply before React renders. No flash of original content.

Framework Agnostic

Works with CRA, Vite, Remix, Gatsby — any React setup.

Real-Time Analytics

Watch conversions update live. Statistical significance calculated automatically.

No SDK Required

Just a script tag. No npm packages or complex integrations.

Install in 5 Minutes

Option 1: Add to index.html (Recommended)

public/index.html

<!DOCTYPE html>
<html>
  <head>
    <!-- Add ExperimentHQ before other scripts -->
    <script 
      async 
      src="https://cdn.experimenthq.io/snippet.min.js" 
      data-site="YOUR_PUBLIC_KEY"
    ></script>
  </head>
  <body>
    <div id="root"></div>
  </body>
</html>

Option 2: Using react-helmet-async

App.jsx

import { Helmet } from 'react-helmet-async'

function App() {
  return (
    <>
      <Helmet>
        <script 
          async 
          src="https://cdn.experimenthq.io/snippet.min.js" 
          data-site="YOUR_PUBLIC_KEY" 
        />
      </Helmet>
      {/* Your app content */}
    </>
  )
}

That's it! No npm install, no context providers, no hooks to implement. Just add the script.

Works With Every React Setup

ExperimentHQ works with any React framework or build tool:

Create React App

Vite

Next.js

Remix

Gatsby

Parcel

Webpack

+ Any other

Why No SDK is Better

Most React A/B testing tools require SDK integration. Here's why ExperimentHQ's approach is better:

Zero Bundle Impact

Our script loads separately — doesn't bloat your JS bundle

No Code Changes

Don't need to modify components or add providers

Instant Updates

Change tests without deploying new code

Works With Any State

Redux, Zustand, Context — doesn't matter

6 High-Impact Tests for React Apps

1 Landing page hero section

Very High ImpactEasy

2 Onboarding flow steps

Very High ImpactMedium

3 Pricing page layout

Very High ImpactMedium

4 Feature page copy

High ImpactEasy

5 Modal and popup timing

High ImpactMedium

6 CTA button variations