How to Run Email A/B Tests in Hubspot

Email A/B testing in Hubspot lets you compare two versions of a marketing email so you can learn what drives better opens, clicks, and conversions. This step-by-step guide explains how to create, configure, send, and analyze A/B tests inside the email tool.

Using controlled experiments instead of guesswork helps you refine subject lines, content, designs, and send times to improve performance over time.

What is email A/B testing in Hubspot?

Email A/B testing in Hubspot is a method of sending two variations of the same email to small segments of your list, then automatically sending the winning version to the remaining recipients based on your chosen metric.

You create two email versions, define a testing group size and winning metric, and let the system measure which version performs better.

Requirements for Hubspot email A/B tests

Before you begin, make sure your account and email are eligible for A/B testing.

Account and access requirements in Hubspot

You must have access to the marketing email tool.
Your subscription level must support A/B testing of marketing emails.
You need permission to create and send marketing emails from your account.

Email type and sending requirements

A/B tests are available for regular marketing emails, not for simple test sends.
You must select a send time and a recipient list or lists.
Your total recipient count must be large enough to split into a test group and a remaining group.

How to create an A/B test email in Hubspot

The A/B setup process lives directly inside the email editor. You start with a single email and then create a variation.

Step 1: Create a new marketing email

In your Hubspot account, navigate to Marketing > Email.
Click Create email and choose a regular marketing email.
Select your template and configure basic settings such as the internal name, from address, and primary language.

Step 2: Turn the email into an A/B test in Hubspot

In the email editor, locate the A/B testing toggle or option.
Enable A/B testing to create a second variation of your existing email.
Hubspot will duplicate the original as version B so you can edit only the elements you want to test.

Step 3: Decide what to test

Focus on one main variable at a time so you can attribute performance changes correctly. Common elements to test include:

Subject line and preview text
Sender name and email address
Email copy length or messaging angle
Call-to-action (CTA) text, color, or placement
Layout, images, and overall design
Personalization tokens or smart content rules

Edit version B to change only the selected element while keeping everything else as similar as possible.

Configure Hubspot email A/B test settings

After both versions are ready, configure how the test will run and how a winner will be selected.

Choose the winning metric in Hubspot

Hubspot allows you to pick the main metric that will decide which email wins. Typical choices include:

Open rate — best when testing subject lines or sender names.
Click rate — useful when testing CTAs, layout, or in-email content.
Click-through from opens — ideal when both open and engagement matter.

Select the metric that best matches your test goal.

Set the test group size

You choose what percentage of your total recipients will receive the A/B test. The remaining percentage will receive the winning version after the test concludes.

The test group is split evenly between versions A and B.
A larger test group yields more reliable data but leaves fewer recipients for the winning send.
For very large lists, you can use a smaller percentage and still get statistically useful results.

Define the test duration

Specify how long Hubspot should wait before selecting a winner automatically. During this time, the test group will receive the two variations, and performance will be tracked.

Short tests (e.g., a few hours) work for time-sensitive campaigns.
Longer tests (e.g., 24 hours) capture more engagement behavior.
Make sure the duration aligns with when your audience typically opens emails.

Set a default winner if results are inconclusive

If the difference between A and B is too small, the system may not confidently choose a winner. In that case, you can define a default version to send to the remaining recipients.

Choose A or B as the fallback winner.
Use this option when your test group is small or when you expect similar performance.

Sending your Hubspot A/B test email

Once your variations and settings are ready, you can send or schedule the campaign.

Confirm recipients and send time

Select one or more recipient lists and apply any necessary exclusion lists.
Review the total number of contacts eligible to receive the email.
Choose Send now or schedule a specific date and time.
Verify that your time zone settings are correct.

Run pre-send checks

Before sending, review both A and B versions carefully.

Check personalization tokens and smart content rules.
Preview on desktop and mobile for both versions.
Run spam and deliverability checks if available.
Send test copies internally to stakeholders for review.

How Hubspot selects the A/B test winner

After the test duration ends, the system evaluates the chosen metric to determine which version performed better.

If one version clearly wins based on the selected metric, it is sent to the remaining recipients.
If results are too close to call, the default winner you selected is used.
The send to the remaining recipients happens automatically; you do not need to manually trigger it.

The test phase and the final send collectively form the complete campaign.

Analyzing Hubspot A/B test results

Once the campaign is complete, use the email performance dashboard to understand what worked and what did not.

Key metrics to review

Open rate for each version
Click rate and click-through rate
Unsubscribes, spam complaints, and bounces
Top clicked links and CTAs
Device type and client breakdown

Compare these metrics between version A and B to confirm whether the winning version aligned with your expectations.

Apply insights to future Hubspot campaigns

Use what you learned from the test to improve future sends.

Document the winning subject line patterns or design elements.
Share results with your marketing team for ongoing optimization.
Plan follow-up tests that build on previous insights, such as testing a new CTA after validating the best subject line approach.

Best practices for A/B testing in Hubspot

Following a few simple practices will help you get more reliable and useful results from each test.

Test only one major element at a time for clarity.
Ensure your audience size is large enough for a meaningful split.
Run tests regularly instead of treating them as one-off experiments.
Align your winning metric with your primary campaign goal.
Avoid drawing strong conclusions from very small differences in results.

Additional Hubspot A/B testing resources

For more detailed, product-specific instructions, refer to the official documentation on running A/B tests in the marketing email tool. You can review the full feature walkthrough directly in the product help center.

Official documentation: How to run an A/B test on your marketing email

If you need strategic support beyond the native help content, you can also work with experienced consultants who specialize in marketing operations and optimization. For broader marketing automation and CRM strategy guidance, visit Consultevo for consulting and implementation services.

By consistently running structured A/B tests in Hubspot, you can transform every campaign into a learning opportunity and steadily improve the performance of your email marketing program.

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Hupspot email A/B testing guide