Nelio AB Testing


Nelio A/B Testing is the most powerful and versatile conversion optimization service for WordPress. It helps you define, manage, and keep track of A/B Tests, combined with powerful and beautiful Heatmaps. Nelio’s also compatible with WooCommerce. In particular, you can test alternative names, featured images, and descriptions for your products, and use your orders as conversion actions (so that you can make sure that a certain product has been purchased).

Get everything you need from within your WordPress dashboard, where you’ll benefit from a lovely, integrated, and familiar user experience.

The Most Powerful A/B Testing Solution for WordPress
Improve your landing pages, write better posts, create alternative pages, go beyond simple title testing and start testing headlines, try new themes, test different menus, modify your CSS rules, test custom post types, and test alternative widgets! Moreover, we designed Nelio A/B Testing to be compatible with your most beloved WordPress plugins such as, for instance, OptimizePress, Gravity Forms, Ninja Forms, or Contact Form 7.

Designed as a Service
Our plugin lifts all the processing load from your own server and takes it back to our cloud. This way, A/B tests do not slow down your site or interfere with your hosting provider limits. In addition, in our opinion services guarantee an amazing support, because we have to earn your trust day by day!

Our plugin comes with an easy-to-setup free trial. Just download the plugin, start your Free Trial, and discover what Nelio can offer you. Once the free-trial is over, simply subscribe to one of our plans and get an account to keep improving your WordPress site!

Reasons for choosing Nelio

Take a look at the following reasons for choosing Nelio A/B Testing!

#1 – Native A/B Testing Solution for WordPress

There’s no need to learn an external tool. Define, manage, and track the progress of your tests directly from within WordPress. Nelio A/B Testing provides a lovely and well-known user interface that simplifies the process of creating alternatives and applying the winning ones.

#2 – Create Alternative Content for your Pages, Posts, and Custom Post Types

When creating A/B tests, the first things you’ll want to test are the pages of your website. Does this button work? Do my visitors go from the landing page to my pricing page? What if I change this background image? Nelio A/B Testing makes page, post, and custom content tests super easy!

#3 – Go beyond simple title tests—Test Headlines!

Are you a Publisher? Are you an avid blogger? Then, you probably want to deliver to every reader a more engaging and relevant reading experience. Nelio A/B Testing includes is the first A/B testing tool for WordPress that offers Headline tests. Given a post in your site, create alternative titles, excerpts, and featured images, and discover which combination takes more visitors from anywhere in your site to your post!

#4 – Test Widgets

Nelio A/B Testing is the only solution that includes Menu and Widget Testing. Use the WordPress’ default user interface for creating new menus and widget sets. You’ll be able to duplicate your current menus and widgets, and modify them with just a few clicks. Discover which combination improves your conversion rate!

#5 – Beautiful Heatmaps and Click-maps

Heatmaps (and Click-maps) offer valuable information about what your visitors do and don’t do when they land to your website. Also, they are a perfect companion of A/B tests, for they give insights on what to text next and help you understand the progress of your tests.

#6 – Test Alternative Themes and CSS

If you’re planning to change your theme, or tweak its CSS rules, make sure they’ll benefit your business. Nelio A/B Testing makes theme and CSS testing extremely easy! Simply select the themes you want to test (or define the alternative CSS rules you want to apply), and the plugin will take care of the rest.

#7 – Conversion Actions and Evolution of Your Tests

With Nelio A/B Testing, you can track the important actions your visitors take. Don’t get lost with tons of irrelevant options and data. Focus on what matters. Our plugin will offer you fresh information about the evolution of the test, with nice graphics about visitors and conversions.

#8 – Cache Support and Server Load

One of our priorities is efficiency. The process of A/B testing a site is not necessarily at odds with performance. Nelio A/B Testing implements several mechanisms to reduce the impact of testing your site, such as support for cache systems in WordPress and optional site-wide consistency (if you’re testing a page or post, not only that page or post has to change, but also any page that includes a widget referencing it).

#9 – Outstanding Support

We work very hard to offer an amazing support to all our customers. If you encounter compatibility issues or you have problems setting the plugin up and running, contact us and we’ll do our best to help you!

#10 – Subscription Plans that Fit Your Needs

Nelio A/B Testing aims to offer a complete A/B testing experience for everybody. That’s why you can create an unlimited number of tests of any kind subscribing to any of our packages. Just check our subscription plans and select the one that better suits your needs.

As Featured On…

If you’re not convinced yet, take a look at what others say about Nelio A/B Testing.


  • Monitor and track the progress of your tests easily. Our results page offers an intuitive user interface that helps you to focus on what really matters.
  • Create tests quickly and effectively from WordPress. The user interface follows the new design guidelines introduced by Gutenberg.
  • Nelio A/B Testing supports different types of tests so that you can be more precise with your tests and goals.
  • The plugin comes with an overview page that shows you all the information you need about your running tests at a glance.
  • Our service lets you analyse the hottest areas of any page on your site so that you can understand your customers better.
  • Not only does the plugin include heatmaps, but it also features scrollmaps and confetti maps.


About Nelio’s Free Trial

Nelio A/B Testing includes a Free Trial. During the Free Trial, you’ll be able to run all the tests you want* and benefit from our personalized support. In order to start the Free Trial, simply install the plugin (as described below) and accept our Terms and Conditions and Privacy Policy (see the Welcome screenshot).

After the Free Trial is over, you’ll need an account to continue using Nelio A/B Testing. Simply subscribe to our service and we’ll send you an e-mail with your account information.

* The Free Trial includes up to 1,000 page views.

Installation through the WordPress Dashboard

  1. Login to your WordPress admin.
  2. Click on the plugins tab.
  3. Click the Add New button.
  4. Search for “Nelio AB Testing” or “AB Testing.”
  5. Look for our plugin, click “Install Now” and then “Activate.”
  6. Once the plugin is installed and active, you can either start a new free trial or you can configure your Nelio account.

That’s it! You may now head to the new menu item on the left labeled “Nelio A/B Testing.”

Alternative installation methods

  1. Download this plugin.
  2. Login to your WordPress admin.
  3. Click on the plugins tab.
  4. Click the Add New button.
  5. Click the Upload button.
  6. Click “Install Now” and then “Activate.”
  7. Once the plugin is installed and active, you can either start a new free trial or you can configure your Nelio account.

I successfully installed the plugin. What should I do now?

If you have successfully installed our plugin using one of the aforementioned methods, now it is just time to use it! Take a look at our Getting Started Guide to cover the basics.


Why should I use an A/B Testing Solution specifically designed for WordPress?
  • Smooth learning curve. There is no need to learn yet another tool.
    Everything (from the creation of tests to the visualization of the results) is done from the WordPress dashboard you are familiar with, resulting in a well-known, perfectly integrated user interface.
  • Evolve your WordPress site easily. A native WordPress solution automates and simplifies the evolution of your site. Consider, for example, applying the winner alternative in your site as soon as the results are statistically significant. With a native solution, this is as easy as clicking one single button. With a generic tool, on the other hand, you would have to manually modify the page so that it integrates the changes you created in the (winning) alternative.
  • Fine-grained testing. The “testing unit” in a generic tool is the web page, since the HTML of the page is the only thing those tools have access to. A native WordPress solution, however, permits you to test any WordPress specific component, such as posts, pages, CSS, themes, child themes, and many more coming!
More questions? Take a look at our site!

We keep an up-to-date Knowledge Base with FAQs, Troubleshooting, compatibility discussions, and more!


January 23, 2020
El plugin es simplemente genial, es muy fácil de utilizar y sus opciones son muy completas. Si quieres realizar test A/B este el el plugin que necesitas, no busques más. El sistema de soporte de Nelio es estupendo. Me salio un problema de incompatibilidad con otro plugin en menos de 2 horas tenía respuesta y en menos de 24 horas tenía una actualización solucionando el problema.
January 20, 2020
Este es, de largo, el mejor plugin de test a/b para WordPress a día de hoy. No solamente ofrece una herramienta completa si no que dispone de extras como los mapas de calor, de clics y de confetti que aportan un valor enorme y que no están disponibles en otras plataformas como por ejemplo Google optimize. Bravo por el equipo de Nelio.
November 8, 2018
I have 2 relatively small sites and it was suggested to me by Dom Wells at HPD that I try A/B testing now that I've got sufficient traffic. I'm a beginner with A/B testing and found Nelio. I have to say I'm glad I did. (Side note: Nelio allows you to use 2 of the $29 plans if the more expensive plan is a bit much for you.) I learned some interesting things, and found out some of the changes I made actually LOWERED my click through rates, rather than improving them! That kind of data is excellent. Data is displayed well, and making an alternate test page was much easier than I expected. For small changes you can have a test running in below 1 minute. I've had some technical issues pop up (as often happens with WordPress) and support has been great. Someone wrote: "Other a/b testing software have more features (like user recording sessions) and costs the same or less, but they’re not native to WordPress, so I feel like I’d have to re-create the design in my WordPress site if it performed better to make it match my theme." I don't agree at all. From what I saw, most services are more expensive. (I have no idea that that 2nd sentence was for also, as that's not really the case regardless.) Overall a very good testing plugin with great support and it's affordable. Thanks!
Read all 36 reviews

Contributors & Developers

“Nelio AB Testing” is open source software. The following people have contributed to this plugin.


“Nelio AB Testing” has been translated into 1 locale. Thank you to the translators for their contributions.

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Interested in development?

Browse the code, check out the SVN repository, or subscribe to the development log by RSS.

Change log

5.0.2 (February 3, 2020)

  • Improvement. If the plugin is running on a staging site (and it detects the site as such), the plugin doesn’t track any events. This is the intended behavior, but users might not be aware of it. This version adds a warning in the plugin’s UI letting them know that the current site has been identified as a staging site.
  • Fix. While editing a variant, test icons in the post editor screen looked stretched sometimes. This has now been fixed.
  • Fix. Fixed a PHP Notice when trying to index a char in an empty string.

5.0.1 (January 23, 2020)

  • Bug Fix. When using Beaver Builder, some variants used styles defined in control version. This has now been fixed.
  • Bug Fix. A hook in the admin_body_class filter didn’t always return a valid list of $classes, which could break the UI. This has now been fixed.

5.0.0 (January 14, 2020)

  • Complete Redesign of Nelio A/B Testing!
  • Improved UI and UX. Nelio A/B Testing 5.0 uses the new technologies included in WordPress 5.3, offering a more elegant, intuitive, reponsive, and easier-to-use interface.
  • Under the hood. The plugin has been completely rewritten to make it more reliable and faster.
  • New cloud. We’ve moved our cloud from Google AppEngine to Amazon Web Services.