Nelio AB Testing



Nelio A/B Testing 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! Target a subset of all your visitors with our built-in segmentation engine and track their actions easily. And keep enjoying the benefits provided by WordPress and its ecosystem, as Nelio A/B Testing is compatible with your most beloved WordPress plugins such as, for instance, OptimizePress, Elementor, 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!

A/B Testing for everyone. Just activate the plugin in your WordPress and discover what Nelio can offer you. The free version makes it extremely easy to run Heatmaps and A/B tests on WordPress pages in low-traffic websites. And if you ever need more, you can purchase a premium plan 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, Segmentation, 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.

Moreover, if you’re interested in testing a subset of your visitors, you can do so using Nelio A/B Testing’s segmentation capabilities. Refine the audience you want to understand by defining the characteristics that are relevant for a specific test: country, language, device, referrer, date, time, and more!

#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 – ✨ Premium 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 purchasing any of the premium plans. Just 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.


Nelio A/B Testing can be used for free!

Free users get up to 500 page views per month. If you have a low-traffic website, you’ll be able to run Heatmaps and A/B tests on your WordPress pages easily and effectively.

If your website grows or if you want to run other types of tests, you need to purchase a premium plan. Once you do, we’ll send you an e-mail with your account information.

In order to use the free version of Nelio A/B Testing, install the plugin as described below and accept our Terms and Conditions and Privacy Policy (see the Welcome screenshot).

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 use the plugin for free or 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 use the plugin for free or 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!


20 February 2024 1 reply
This service has a plugin and has the advantage of allowing you to natively A/B test on your site. It offers heatmaps, too. It's a simple interface and works really well. I did experience an issue with installing it on a client's sites due to their specific setup, however after contacting Nelio directly, they got back to me in a few minutes, helping to resolve the issue very quickly indeed. You don't get service like that often, so it's definitely recommended.
19 January 2024 1 reply
With Nelio AB Testing I can do as much as more expensive platforms and have so much more control. Testing was easy to setup beyond headlines and order buttons. I highly recommend this plugin to clients with the traffic to test.
14 January 2024 1 reply
It is an excellent plugin with an easy setup, friendly interface, various testing options and quick and responsive customer support. Highly recommended!
12 December 2023 1 reply
I purchased this plugin to do some AB testing. Our clients are using Hubspot forms on their WordPress sites. I didn't see a native ability to do that, so I reached out to support and they had a Beta version with Hubspot capabilities back to me within 24 hours and it's working great. Highly recommend!
Read all 73 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 7 locales. Thank you to the translators for their contributions.

Translate “Nelio AB Testing” into your language.

Interested in development?

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


6.4.2 (February 23, 2024)

  • Apply the_content filter on page test.

6.4.1 (February 21, 2024)

  • Fix preview nonce to prevent preview expiration notice.
  • Fix cookie segmentation rule.
  • Swap menu when it’s a tested menu (regardless of its being the control version or a variant).
  • Remove legacy compat file for Yoast SEO.
  • Add extra attribute into inline script to prevent CloudFlare from loading it asynchronously.
  • Add segmentation data to Form, WC, and EDD conversion actions.
  • Require PHP 7.4.

6.4.0 (February 13, 2024)

  • Integrate Nelio Session Recordings.
  • Add support for WooCommerce’s HPOS.
  • Add hook to prevent Perfmatters from delaying tracking script.
  • Add new action nab_settings_screen_after.
  • Add new action nab_site_updated.
  • Add new filter nab_edd_order_value.
  • Add new filter nab_show_session_recordings_page.
  • Add new filter nab_tab_settings.
  • Add new filter nab_wc_order_value.
  • Add new setting to test existing menus against each other.
  • Load experiments page after creating free site.
  • Remove unused REST endpoint.
  • Replace filter nab_track_order_total with nab_track_wc_order_total and nab_track_edd_order_total.
  • Replace post title in test using hook arguments only to prevent menus from being incorrectly replaced.
  • Use letters instead of numbers in all “Variant” labels.
  • Fix click tracking to allow IDs and classes starting with number.
  • Fix hook to backup control version of a menu test.
  • Fix notice when sending email on auto-stop.
  • Fix results retrieval to properly determine if a test should be auto-stopped.

6.3.3 (January 10, 2024)

  • Fix invalid downgrade to free plan on page refresh.

6.3.2 (January 8, 2024)

  • Integration with

6.3.1 (December 22, 2023)

  • Fix Deprecated message on newer PHP versions.

6.3.0 (December 18, 2023)

  • Track HubSpot form submissions.
  • Add new setting to exclude certain IPs from being tracked.
  • Fix style of field descriptions in plugin settings screen.
  • Load latest 3 news in dashboard widget.
  • Improve dashboard widget styles.
  • Remove no_found_rows from post searcher query to allow pagination.
  • Keep start date when restarting a test.
  • Add warning message in heatmap renderer to let users know they should disable adblockers.
  • Add extra filters to make sure alternative title, content, and excerpt are properly loaded.

6.2.1 (November 23, 2023)

  • Fix GDPR cookie detection: it should be able to detect exact matches (i.e. when no * is used).
  • Fix GDPR cookie value parsing: unescaped = symbols should be allowed.

6.2.0 (November 6, 2023)

  • New Feature. Support events from The Events Calendar (beta).
  • New Feature. Restart previously-stopped tests.
  • Improvement. Allow partial name match in GDPR cookie setting.
  • Improvement. Allow value match in GDPR cookie setting.
  • Improvement. Add Pause action in test list screen.
  • Improvement. Increase max heatmap height from 30,000 to 100,000px.
  • Add Overview widget with quick access to last updated tests and news from our blog.
  • Add Roadmap section in plugin to let users know what we’re working on.

6.1.0 (October 26, 2023)

  • New Feature. Add domain forwarding setting to enterprise users.
  • Improvement. Tweak LiteSpeed Cache integration to exclude CSS overlay from being optimized.
  • Improvement. Remove external dependencies on frontend scripts to prevent cache/optimizer issues.
  • Improvement. Show REST API’s error message in editor when something goes wrong (instead of generic message).
  • Improvement. Redesign “Add Test” section to organize tests in categories.
  • Improvement. Refactor account store to manage agency accounts more safely.
  • Bug Fix. Enable previews and heatmaps on drafted A variants.
  • Bug Fix. Select “Heatmap” tab on heatmap viewer when changing active variant.
  • Bug Fix. Replace Elementor original content with alternative’s on posts_results and get_pages to fix style issues.

6.0.9 (October 11, 2023)

  • Bug Fix. Disable variant B until control version is set.
  • Bug Fix. Use alternative post ID in front page’s preview to properly render heatmap.
  • Bug Fix. Set proper scope in auto page view action when editing headline test.
  • Bug Fix. Remove heatmap overlays from proper parent element to prevent JS error.
  • Bug Fix. Prevent page reload when clicking on a hash link to the current page.
  • Improvement. Remove “Product Variations” from page view’s “Content Type” setting.
  • Improvement. Format x axis values in result charts.
  • Improvement. Include middle-button clicks in heatmap tracking.
  • Improvement. Add button to “Reset” an existing variant in test editor.
  • Improvement. Find elements in heatmap using control and alternative post IDs.

6.0.8 (October 5, 2023)

  • Bug Fix. Initialize nab object in main script as soon as the script runs to prevent custom events from failing due to its being undefined.
  • Bug Fix. Remove enabled prop from the JSON encoding of actions whose type is php-function to allow alternative edit.
  • Improvement. Add defer strategy to admin helper scripts.

6.0.7 (October 3, 2023)

  • Bug Fix. Set proper conversion action scope after toggling page-view’s ID/URL mode.
  • Bug Fix. Clean page-view unused attributes on test save.
  • Bug Fix. Remove closures from test goals when duplicating test to prevent fatal error.
  • Bug Fix. Remove unnecessary code to prevent fatal error in front if Easy Digital Downloads is enabled.
  • Bug Fix. Compute ARPC improvement using ARPC values instead of plain revenue values.
  • Bug Fix. Add leading zeros when required in revenue and ARPC cents.
  • Bug Fix. Add hook to properly get WooCommerce “shop” ID when a test is running and thus be able to run tests on it.
  • Improvement. Add compatibility with LiteSpeed Cache.
  • Improvement. Add compatibility with RapidLoad Cache.
  • Improvement. Require page view URLs to start with https://.

6.0.6 (September 28, 2023)

  • Bug Fix. React to Nelio A/B Testing’s messages only in heatmap view renderer.

6.0.5 (September 28, 2023)

  • Bug Fix. Fix “Revenue” and “ARPC” improvement factors (thanks @cutu234).

6.0.4 (September 27, 2023)

  • New Feature. Send notification email when site with limited quota runs out of quota.
  • New Feature. Add goal tracking scope to customize where conversion actions can be tracked.
  • Bug Fix. Add proper capability checks in admin bar menu.
  • Bug Fix. Disable “Global Consistency” by default when creating a test using the admin bar.
  • Bug Fix. Fix default script exclusions in WPRocket to make it compatible with Nelio.
  • Bug Fix. Remove “nab*” classes from body when extracting CSS selector in click action.
  • Bug Fix. Use current CSS selector when first “Exploring” variant in conversion action.
  • Improvement. Add button on the account page to copy “Support Key”.
  • Remove legacy code.

6.0.3 (September 14, 2023)

  • Bug Fix. Add missing REST API endpoint in latest update.

6.0.2 (September 14, 2023)

  • Bug Fix. Fix capability issue in Professional and Enterprise plans.

6.0.1 (September 14, 2023)

  • Bug Fix. Change text domain in some strings.
  • Bug Fix. Keep element highlights in CSS selector after navigating to different pages.
  • Bug Fix. Fix segmentation check in public script.
  • Bug Fix. Add safe guard to make sure WC function exists.
  • New Feature. Allow quota limits per site on some plans.
  • New Feature. New Easy Digital Downloads conversion action.
  • New Feature. Add custom capabilities in Nelio A/B Testing. You may need to temporarily deactivate and then reactivate the plugin to load this new capabilities.

6.0.0 (September 4, 2023)

  • New Feature. Add new setting to define custom tracking URL and, thus, bypass ad blockers.
  • Bug Fix. Fix issue with action “product added to cart” when using product variations.
  • Bug Fix. Fix issue rendering action “product added to cart” on test editor.
  • Bug Fix. Track “product added to cart” events in WooCommerce 7.8+.
  • Bug Fix. Show proper account actions when using an invitation.
  • Bug Fix. Fix “Days Running” computation for running tests.
  • Improvement. Heatmaps – Avoid recomputing bounding boxes in heatmaps to speed up rendering.
  • Improvement. Heatmaps – Fetch page elements and load heatmap data in parallel to speed up rendering.
  • Improvement. Skip query arg preloading on pages running inline tests only.
  • Improvement. Combine all public scripts into a single one to speed them up.
  • Improvement. Enqueue public script if there are running tests or the requested page has a heatmap.
  • Improvement. Improve CSS tests to skip redirection when loading alternative styles.
  • Improvement. Add WooCommerce hooks only if WooCommerce is active.
  • Improvement. Add custom values in “Duration” and “Page Views” end modes.
  • Improvement. Enable additional custom goals in tests that have preset goals.
  • Improvement. Add new filter nab_get_queried_object_id.
  • Improvement. Remove unnecessary code to migrate old tests.
  • Improvement. Enable no_found_rows flag in WP_Query to improve performance (thanks @donbowman).