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The Power of Split Testing in eCommerce

This post is part of a series called Fundamentals of eCommerce .
How to Set Up Your First Magento Store

If you own or manage an eCommerce store, one question matters above all others. You'll do whatever it takes to find out the answer.

How can I sell more stuff?

There are a ton of different strategies you can use. One is to get more traffic to your store through SEO, paid ads, and social media marketing. Another is to reach out to your customers through email. These are both important.

But once you've got traffic, is that it?

Definitely not.

When people have walked through the doors of your virtual store, are they enticed to buy? Or do they run away before they've even had a chance to check out a single product?

The design of your website matters. In the real world, it's called visual merchandising, and bricks-and-mortar stores spend hundreds of thousands of dollars making sure they've got it just so.

Likewise, your website copy matters. This is your virtual sales patter, and it's what convinces your customers to click the buy button.

How can you optimize your store so more of your website visitors become customers?

You can flounder in the dark, guessing at different designs, structures and copy, hoping you've got it right this time.

Or you can split test.

Are you naturally curious? Do you want to know why things are the way they are? If you answered yes to either of these questions, then you'll love split testing. With split testing, you'll quickly learn why popular websites are designed, structured and written as they are.

You'll also learn how to make your website the best it can be.

Let's get going.

What Is Split Testing?

Split testing is a powerful weapon in the arsenal of eCommerce traders. With split testing, you can change any element of your website, and observe how that change impacts your customers' behavior.

You can see the precise impact of the change, because some visitors will be shown the website as it was before you made the change, while others will only see it after you've made the change.

With split testing, you can see whether the changes you make get your customers to:

  • Click where you want them to click.
  • Spend more time on a specific page, or on your website.
  • Sign up to your email list.
  • Buy a specific product.
  • Buy more stuff overall.

Why is Split Testing so Powerful?

Sometimes, split testing will have drastic results. For example when the BBC first tried split testing on the World Service website, it found a small tweak to the copy resulted in three times more people clicking a particular link. Similarly, CrazyEgg.com got 64% more conversions from their homepage by adding a short video with the same message as their homepage copy.

It's actually equivalent to a 165% improvement, because of a process known as compounding.

Those are some sweet examples, and if you hit the jackpot like that, you'll of course be delighted you tried split testing.

But most of the time you will only see tiny improvements of a few percent in each split test, if you see any improvement at all. After all, it's a test, and tests can show that your original website was the best one.

Yet the real power of split testing lies in multiple small improvements.

Let's say you find 20 small improvements, each of which improve your conversion rate by 5%. That should equal a 100% improvement in sales, right (because 20 x 5 = 100)?


It's actually equivalent to a 165% improvement, because of a process known as compounding.

Let's say you start with 400 conversions a week. Adding 5% makes 420 conversions, or 20 extra than you started with. The next time you add 5%, you're starting from a base of 420, so the increase this time is 21. It might seem insignificant, but it quickly adds up.

What Can You Split Test?

Split testing can be used for all kinds of marketing, from pay-per-click ads to email campaigns. In this article, we're focused on what you can split test on your eCommerce website.

You can test anything on your eCommerce site that might change how your website visitors behave. If you can tweak it, you can test it. That includes your design and your copy.

You can test simple things such as:

  • the color of a buy button
  • product descriptions
  • product photographs
  • product page layout
  • pricing
  • the design of sign-up forms

Or you can test more complicated things, such as:

  • The overall structure of your site.
  • How you categorize products.
  • How your search bar functions.
  • Different types of check-out process.

All of these have the potential to make a difference.

When you're split testing changes on your site, it's worth tweaking one thing at a time. The smaller you make your experiments, the more aware you'll be of precisely what works at bumping up your figures. When you know what works in one area of your website, you can apply it elsewhere.

Split Testing Case Studies

When deciding what to split test, it's worthwhile getting to grips with what has worked for other Internet marketers. Knowing what's worked well for others can help you make a better guess of what could work for you.

There are a ton of case studies available online. If you really want to geek out, you'll love the blog Which Test Won?, where you can test your marketing instincts against the results of real split tests.

Here are three tests we love:

One Word, Triple Conversions

The BBC World Service's web developer didn't try split testing until 2010. When he did, the results astonished him. Three times more people decided to install the BBC World Service widget when visiting the website. And the change came from adding just one word.

The text on the button to install the widget was changed from Widget to Install Widget. That's a great example of how tiny tweaks can make a big difference. It also demonstrates the importance of writing clearly.

Full story BBC AB Testing Full story: BBC A/B Testing.

Even Web Marketers Need Help Sometimes

Crazy Egg, a tool that lets website owners track the behavior of visitors, turned to web marketing company Conversion Rate Experts for help with split testing.

The result was a massive 363% increase in conversion rates. This is a fine example of compounding in practice, and shows that sometimes it takes lots of little tweaks to make a big difference.

The changes that helped conversions included:

  • Talking with customers, then writing the homepage copy in the language they used.
  • Talking with sales staff to find the language they used to sell the product.
  • Reframing the price, by showing the value it represented compared to other options.
  • Adding a video to the home page.
  • Making the home page 20 times longer.
  • Optimizing the checkout process.

Full story Does optimization ever end How we grew Crazy Eggs conversion rate by 363 Full story: How we grew Crazy Egg’s conversion rate by 363%.

Why It's Best to Keep Tests Small

When MailChimp noticed it had over 300,000 failed login attempts per month, it knew it had a problem, so it set to work making it easier to login. This included adding social login buttons, such as Log in with Facebook.

The changes helped massively, resulting in a 66% drop in failed logins.

But then the MailChimp CEO stepped in and told his team he was "extremely repulsed" by the social login options and wanted to "restore simplicity".

The team stood their ground, but the CEO refused to listen. In the end, the social login buttons were removed. Surprisingly, the failed login rate hardly changed.

After some digging, the MailChimp team discovered it was other changes they'd made to the login process that had significantly reduced the failed login attempts.

The lesson? Keep your tweaks and split tests small, so you know what's really making the difference.

Full story Social Login Buttons Arent Worth It Full story: Social Login Buttons Aren’t Worth It.

Split Testing Tools

The easiest way to start split testing on your eCommerce store is to install a split testing app. Shopify, Bigcommerce and Magento all include split testing apps or extensions. These apps all cost money, but it's a worthwhile investment to make your site the best it can be.

There are a range of split testing apps to choose from, including:

  • Optimizely. The big draw of Optimizely is its ease of use. Whatever platform your eCommerce store uses, you can be up and running in just a few minutes. What's more, with Optimizely's point-and-click redesign option, you don't need coding experience to set up experiments. Prices start at $19 per month.
  • Visual Website Optimizer. With prices starting at $49 per month, VWO is at the expensive end of the market. In return, you get heat map reporting, and the option to run split tests on specific segments of visitors.
  • Experiment.ly. What makes Experiment.ly stand out from the crowd is it's combo testing feature, so you can test every combination of colors, text and images you can think of with multivariate testing. The starter package costs $27 per month.

Split Test Your Way to Sales

Whether you're just starting out, or you're an established trader, split testing can take your business to the next level. By focusing on what makes sales happen, you'll channel your energies in the right direction.

Discover great WordPress eCommerce themes and other top eComerce themes on Envato Elements and ThemeForest.

Have you ever tried your hand at split testing? What were your results?

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