How I Run A/B Tests in Webflow Without Using Third-Party Tools
A/B testing is a powerful way to optimize your website, but most guides assume you’ll be using tools like Google Optimize, Optimizely, or expensive SaaS platforms.
But what if you want to run simple A/B tests on your Webflow site, without relying on third-party tools?
That’s exactly what I started doing on client projects when I needed light experiments for headlines, calls to action, or design tweaks.
In this post, I’ll show you how I set up basic A/B tests in Webflow using just JavaScript and the Webflow CMS, without the need for external tools.
What types of A/B tests can you run this way?
You can easily test variations such as:
- Headlines or text
- Call-to-action button colors or wording
- Hero section images
- Different section layouts
Ideal for small experiments on static pages, landing pages, or CMS templates
Basic concept
- Randomize on page load Instead of using a testing platform, you can write a simple script that:
- Randomly displays version A or version B when the page loads
- Track the result using Webflow’s native templates or Google Analytics events
Example 1 : A/B test on headline text
HTML in Webflow:
Place both versions of the headline inside a div and assign them classes:
<h1 class="headline headline-a">Get 50% off your first order!</h1>
<h1 class="headline headline-b">Try us today — 50% off!</h1>
JavaScript for Randomization:
document.addEventListener("DOMContentLoaded", function() {
const showA = Math.random() < 0.5;
document.querySelector('.headline-a').style.display = showA ? 'block' : 'none';
document.querySelector('.headline-b').style.display = showA ? 'none' : 'block';
});
Example 2 : A/B test button color
In your Webflow Designer, create two buttons with different styles and wrap them in a div.
The JavaScript will show one and hide the other on load, just like with the headline.
How do I track results?
You'll want to track conversions or clicks for each variation.
Here’s how I did it:
- Events in Google Analytics -Fight an event when a user clicks a call-to-action button using gtag() or dataLayer.push()
- Webflow forms-Add a hidden input with the variation name and pass it when users submit the form
- Simple click counter with JavaScript-Store results in Google Sheets or Airtable via webhook
Use Webflow CMS for dynamic A/B content
If you want to A/B test content on CMS collection pages, you can:
- Add a toggle or option field to select a variant in the CMS
- Use conditional visibility to show the correct version based on CMS data
- Randomly arrange only certain elements while letting the CMS control the rest
Limitations of this method
This works great for simple A/B tests, but:
- No automatic statistical analysis
- Will not perfectly balance traffic between versions (randomness is not accurate)
- You will have to manually analyze the results in GA or Sheets
Why I use this method on Webflow Projects?
- No external scripts or tracking pixels
- Full control over styling within Webflow
- Keeps the page lightweight
- Ideal for small-scale experiments
You don't need expensive tools to start testing and improving your Webflow site.
With a little JavaScript and Webflow's native features, you can run basic A/B tests, collect data, and make informed design decisions all without leaving your project.
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