June 20


How to Boost Conversion Rates with Split Testing

By Hanson Cheng

June 20, 2023

  • minute read
  • Last Updated on June 20, 2023 by Hanson Cheng

    In this comprehensive article, readers will learn about the intricate process of split testing, its significance in optimizing websites, and the different types of tests used. The article delves into best practices for setting up, running, and analyzing split tests while providing insights on choosing the right testing tool, defining goals, and tracking results.

    Finally, the article discusses applying lessons learned, implementing winning variations, and continuously refining strategies in the pursuit of optimization. By understanding and following these guidelines, readers can implement split testing to drive improvements and enhance the overall user experience actively.

    Understanding Split Testing

    The Importance of Split Testing

    Split testing, often referred to as A/B testing or multivariate testing, compares two or more versions of a webpage, email, or other digital content to determine which one performs better. The primary goal of split testing is to optimize various elements of a digital asset to maximize its effectiveness in achieving a predefined goal – typically, improving conversion rates.

    The importance of split testing lies in its ability to provide businesses with data-driven insights into the preferences and behavior of their target audience. It allows companies to make informed decisions about their online presence’s design, layout, messaging, and other elements, leading to higher user engagement and revenue growth.

    By continuously testing and tweaking, companies can consistently deliver the best possible experience to their users and maximize their return on investment.

    How split testing works

    Split testing involves comparing two or more variants of a digital asset simultaneously, with the different versions being served to users in a randomized manner. Typically, a portion of the traffic is directed to each version, and the engagement or conversion rates are measured for each.

    Once a statistically significant sample has been collected, the results are analyzed to determine if one variant outperforms the others. If there are any clear winners, they can be implemented permanently, and further testing can be conducted on other elements to optimize the user experience continually.

    For example, suppose a business wants to test different call-to-action (CTA) button colors on its website. In that case, they may create two versions of the same web page: one with a green button and one with a red button. The testing software will then randomly direct users to one of the two versions, and the conversion results will be recorded and compared to determine which color leads to more clicks and conversions.

    Different Types of Split Tests

    There are several types of split tests that can be employed depending on the desired outcome and what elements of the digital asset need to be tested.

    A/B testing

    A/B testing is the simplest form of split testing, involving only two variations of a digital asset. These variations are typically referred to as “A” (the control) and “B” (the challenger). A/B testing is used to measure the effectiveness of a single change, such as a headline, color, or button placement.

    For A/B testing to be most effective, only one variable at a time must be tested. Otherwise, it becomes difficult to determine which variable led to the changes observed in user engagement or conversion rates.

    Multivariate testing

    Multivariate testing is a more advanced form of split testing, allowing for the simultaneous testing of multiple variables within a single digital asset. Instead of limiting the test to just two variations, multivariate testing allows multiple combinations of changes to be evaluated simultaneously. This can be particularly useful when optimizing complex pages with numerous elements that may influence user behavior and conversion rates.

    However, multivariate testing requires a larger sample size to produce statistically significant results, which may require more extended testing periods, depending on the available traffic.

    Split URL testing

    Split URL testing, sometimes called redirect testing, involves testing two or more entirely different web pages. Instead of modifying elements within a single page, as in A/B and multivariate testing, split URL testing compares the performance of entirely different designs or layouts.

    This type of testing is often employed when significant changes are being considered, such as a site redesign or a new user onboarding process. Like A/B and multivariate testing, split URL testing aims to determine which version of the web page is most effective in achieving the desired goal, such as user engagement, time on site, or conversion rates.

    Split Testing Best Practices

    Split testing, also known as A/B testing, is an essential technique in the digital marketing world. It involves testing two different versions of a website, landing page, email, or any other marketing element to determine which one performs better. Split testing can significantly improve conversion rates and overall success when executed correctly. In this article, we will discuss some best practices for split testing.

    Setting clear testing goals

    Before initiating a split test, it’s vital to establish clear goals for the experiment. Identifying your goal will help you focus on the most critical variables to test and analyze the results accurately. Common objectives for split testing include increasing conversion rates, reducing bounce rates, and increasing time spent on site. Make sure your goals are specific, measurable, achievable, relevant, and time-bound (SMART).

    Choosing the right variables to test

    A successful split test relies on selecting the appropriate variables to test. You can modify countless variables during an experiment, but not all of them will significantly impact the results. Focus on variables that are likely to affect user experience and conversion rates. Some common variables to test include visual elements, content, and website functionality.

    Visual elements

    Your website’s or marketing materials’ visual design can significantly impact user engagement and conversion rates. During a split test, consider testing different color schemes, font styles and sizes, button designs, and layout variations to determine which elements resonate best with your audience.

    Content and copy

    The content and copy on your website or marketing materials play a crucial role in communicating your message and value proposition to potential customers. Test different headlines, body copy, calls-to-action, and promotional offers to see which ones yield the best results. Keep in mind that even small changes in wording can lead to significant differences in user behavior.

    Website functionality

    Another critical aspect of user experience is your website’s or marketing materials’ functionality. Test different navigation structures, form designs, and interactive elements to gauge their effect on user behavior and conversion rates.

    Determining the appropriate audience

    For a split test to succeed, targeting the right audience is essential. Consider testing different segments of your audience, such as new visitors versus returning visitors or mobile users versus desktop users. Also, consider creating personalized experiences for various audience segments to boost conversion rates and user satisfaction.

    Running tests for an adequate timeframe

    For your split test results to be valid and reliable, you must run the test for an adequate duration. Running the test for too short a time could lead to misleading results, and you may end up optimizing for the wrong variables. A general guideline is to run a test for at least seven days or until you’ve reached a predetermined sample size that provides statistical significance.

    Ensuring statistical significance

    In order to draw meaningful conclusions from your split testing results, you must ensure that your findings are statistically significant. Statistical significance is a measure of whether the observed results are due to pure chance or an actual difference between the two variations being tested. It is typically represented by a p-value, which must be below a predetermined threshold (e.g., 0.05) to be considered statistically significant.

    To achieve statistical significance, you will need a sufficiently large sample size and a clear difference in performance between the two variations. Before starting a split test, calculate the required sample size using an online calculator or statistical software, and be prepared to run the test until you reach that number.

    By following these best practices, you can optimize your split testing efforts and make informed decisions about your marketing strategies. Continuous split testing and refining your approach based on the results can significantly improve user experience, conversion rates, and overall business success.

    Setting Up Split Tests

    Split testing, also known as A/B testing or multivariate testing, compares two or more versions of a webpage or app to determine which one performs better. It’s critical to conversion rate optimization and helps businesses identify changes that can lead to increased leads, sales, and revenue. 

    Choosing a split-testing tool

    When it comes to split testing, you have a variety of tools at your disposal. Some of the most popular ones include Google Optimize, Optimizely, Visual Website Optimizer (VWO), and Adobe Target. Here’s a brief overview of each:

    1. Google Optimize: Google’s split testing tool is a popular choice because it integrates seamlessly with Google Analytics, making it easy to analyze and understand the results of your tests. It also has a user-friendly interface that helps you easily create test variations on your webpage without needing advanced coding skills. Google Optimize offers a free plan with access to basic features and a premium plan with more advanced capabilities.

    2. Optimizely: Optimizely is a powerful and popular A/B testing platform that offers advanced testing features, including multivariate tests and personalization capabilities. It’s relatively easy to use, but some users may find it more expensive compared to other tools. Optimizely works well for businesses with a larger testing budget and those looking for a more comprehensive testing solution.

    3. VWO (Visual Website Optimizer): VWO is another popular choice for split testing. It has a range of features that make it easy for users to create and analyze tests. Some of its standout features include heatmaps, click maps and audience segmentation. VWO offers multiple plans with varying levels of access, so it’s suitable for businesses of all sizes.

    4. Adobe Target: Adobe Target is a part of the Adobe Marketing Cloud and offers advanced personalization capabilities along with A/B and multivariate testing. It’s best suited for large enterprises that have a need for advanced personalization and in-depth analysis of their tests. Adobe Target is a more costly solution than other tools but can be valuable for businesses requiring advanced features.

    Creating test variations

    Once you’ve chosen a split-testing tool, the next step is to create test variations of your webpage or app. Test variations are alternative versions of a specific page or element that you want to test, such as headlines, images, buttons, or content.

    Start by identifying the elements you want to test and create a hypothesis for how the change might affect your desired goal (e.g., increased conversions, sign-ups, or sales). Then, use your testing tool to create these variations of your webpage or app.

    When creating your test variations, keep in mind that it’s essential only to change one element at a time. This way, you can be sure that any differences in performance are due to the specific change you made and not a combination of factors.

    Defining goals and tracking

    Before launching your split test, it’s essential to define the goals you want to achieve and set up proper tracking to measure the results. These goals can include increasing conversions, sign-ups, sales, or any other important metrics for your business.

    Once your goals are defined, set up tracking within your testing tool to measure the performance of each variation. This could involve setting up event tracking in Google Analytics, integrating with your CRM, or using other tracking methods provided by your testing tool.

    Launch and monitor the test

    With your test variations set up, goals, and tracking in place, it’s time to launch your split test. Most testing tools make this process simple, allowing you to set up the test and push it live with a few clicks.

    After launching the test, you’ll want to monitor the results closely. Ideally, you should let the test run for a predetermined period or until a statistically significant result is reached. This ensures that you’re making data-driven decisions rather than basing your decision on insufficient sample size.

    Keep an eye on your test’s performance, and once you have a clear winner, implement the winning variation on your website or app. This will optimize your conversion rate, leading to increased leads, sales, and revenue for your business.

    Analyzing Split Test Results

    Interpreting test data

    An essential part of analyzing split test results is correctly interpreting the data collected during the test period. This process involves examining key metrics such as conversion rates, bounce rates, and average time on site from each test variation.

    To accurately interpret the data, set up a clear hypothesis before the test begins. This helps measure the tested variables’ performance against set expectations. Also, be cautious of the sample size, test duration, and significance level to ensure the test’s fairness and accuracy.

    Keep in mind that not all data points are of equal significance. For example, a higher click-through rate may seem like an improvement, but if it leads to lower overall conversion rates, then it could be misleading. Always analyze the data in the context of your overall marketing and business goals.

    Identifying trends and patterns

    When examining your split test data, look for emerging trends and patterns. This can provide insights into potential improvements or issues with your website, such as identifying segments of users who may respond differently to certain changes.

    To spot trends and patterns, visualize the results using charts and graphs. For example, use a line chart to track how different variations performed over time and a bar chart to compare the conversion rates of different segments.

    It’s important to remember that observed trends can sometimes be a result of random chance. To reduce the likelihood of drawing false conclusions, make sure you have an adequate sample size and consider conducting additional split tests to verify your findings.

    Quantifying the impact of changes

    To assess the effectiveness of your split test variations, quantify the impact each change brings to your website’s key performance indicators (KPIs). This may involve calculating the relative increase or decrease in conversion rates, average order value, and other metrics.

    Quantification can also involve projecting the financial impact of implementing a specific change. For instance, calculate the project revenue increase based on the improvement in conversion rate for a particular variation. This helps prioritize changes that deliver more significant value to the business.

    Deciding on a winning variation

    Selecting the winning variation is not just about choosing the one with the highest conversion rate or improved KPIs. To make an informed decision, consider factors like statistical significance, the size of the improvement, and the potential effect it may have on the overall user experience.

    Additionally, consider other criteria, such as the effort required to implement the change or the potential risks that might come with it. Weigh these factors in selecting a winner that strikes the right balance between improved performance and potential risks.

    Implementing and Iterating

    Applying the lessons learned

    Learning from split test results goes beyond implementing the winning variation. Analyze both successful and unsuccessful tests to extract valuable insights about your target audience and preferences.

    Use these learnings to guide future tests or modify other areas of your marketing campaigns to optimize them further, such as email marketing, social media marketing, and search engine optimization (SEO).

    Integrating the winning variation permanently

    Once you have identified the winning variation, implement it on your website or digital marketing campaign, replacing the original version. Make sure to track the metrics relevant to the change (such as conversion rates or engagement) to confirm that the implemented change positively affects real-world results outside of split testing.

    Continuously optimizing through additional split tests

    Optimization is an ongoing process. Just because you’ve implemented a winning variation doesn’t mean your website or marketing campaign is perfect. Continuously look for opportunities to improve user experience and performance by conducting additional split tests.

    Remain proactive in identifying potential areas for improvement, such as new design trends, emerging technologies, or changes in customer preferences. As your business grows and evolves, so should your digital strategy and optimization efforts.

    Refining strategies based on results

    As you gather insights and data from various split tests, refine your marketing and website strategies accordingly. Use this data-driven approach while planning future marketing campaigns, product launches, or website updates, adjusting strategies based on your observed patterns and trends.

    Regularly review and update your strategies to ensure they align with your business goals and continue supporting your organization’s growth. By consistently conducting split tests and incorporating crucial learnings into your broader strategies, you can create a more engaging and effective user experience, driving improved results overall.

    Split Testing – FAQs

    What is the purpose of split testing in digital marketing?

    Split testing, also known as A/B testing, serves to optimize digital marketing campaigns by comparing two variations of a single component. Marketers can identify the version producing better results and implement it for improved engagement, conversion rates, and overall campaign success (Kohavi, Longbotham, Sommerfield, & Henne, 2009).

    How do digital marketers decide which elements to test in a split test?

    Digital marketers should prioritize elements with the highest potential impact on campaign goals. Common elements tested include headlines, calls to action, website layouts, images, and design elements. The selection often depends on past performance of similar content and elements identified as conversion drivers (Thompson, 2011).

    How long should a split test be conducted to ensure accurate results?

    The duration necessary for split testing depends on several factors, including website traffic, desired statistical significance, and differences in performance between variations (Pekelis, Walsh, & Barefoot, 2017). Usually, a testing period of 14 to 30 days is recommended to ensure accuracy and account for user behavior variations.

    Can multiple elements be tested simultaneously in split testing?

    Yes, digital marketers can test multiple elements simultaneously using a technique called multivariate testing. However, this method requires significantly more traffic and time to achieve accurate results compared to traditional split tests as the number of variations and combinations increases (Nosenzo, Tufano, & Villeval, 2015).

    What are some limitations and challenges in conducting split tests?

    Limitations of split tests include lacking sufficient traffic for accurate results, unintended biases or influences, choosing an incorrect metric, and overgeneralizing outcomes. Ensuring a large enough sample size, controlled test conditions, and using relevant metrics alleviate such limitations, but findings should be considered in context (Pekelis et al., 2017).

    How can the results of split testing be used to improve marketing strategy?

    When interpreted and analyzed correctly, split testing results offer insights into user preferences and behavior. Marketers can use this data to make informed decisions that optimize campaigns, enhance user experience, refine targeting, and ultimately maximize the return on investment for digital marketing efforts (Hazlett & Platt, 2017).

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    Hanson Cheng

    About the author

    Living in Portugal with my wife and puppies.
    Scaling online businesses and sharing lessons learned on this website and in our email newsletter.

    Always happy to hear from you, so find me on Instagram if you want to say hi!

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