A/B Testing helps you optimize messages by testing up to 10 variants and evaluating performance based on metrics like open rates and click-through rates. This allows you to improve user engagement and make data-driven messaging decisions.

Marketers focused on Lifecycle and Growth can use insights from A/B tests to make impactful improvements that align with broader business goals. Whether you’re testing push notifications or emails, A/B testing allows you to experiment with different designs, copy, calls-to-action (CTAs), and more. For example, test whether:

  • A push with an image outperforms text-only
  • A CTA like “Claim Offer” works better than “Get Started”
  • A short subject line gets more opens than a longer one

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Plan availability

  • Pro & Enterprise Plans: Up to 10 variants
  • Free & Growth Plans: 2 variants

Compare Plans

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How A/B Testing works

A/B testing is only available when sending through the dashboard. It is not available with the API.

To create A/B tests with Journeys, use Journey Split Branches.

When creating push and email campaigns through the dashboard, click the A/B Test button and Add Variant to create additional tests.

Your Audience (included and excluded segments) will be all the users eligible for the campaign.

After you create the variants, you can select a portion of your audience to receive randomized variants i.e. 25% means 25% of the segment(s) selected will randomly receive one of the variants. A message with 2 variants (A & B) targeting 25% will have 12.5% of the audience get variant A and another 12.5% get variant B. A message with 10 variants (A-J) targeting 25% will have 2.5% of the users get each variant.

Image showing percentage scaler for variants.

By default, 25% of your audience receives the A/B test. For valid results, each variant must receive enough users. The more variants you use, the larger your test group must be.

If you set 100%, the message will be sent evenly to all users in the audience and eliminates the ability to send the “winner” to remaining users.

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Select a Winner

Messages that are sent as A/B tests will be marked as such under the Messages Tab. Click into the report for each test to see the full report or view the variant-specific reports.

We provide some statistics for you to view the performance and choose a winner. The below screenshot describes how to view different stats and select a winning variant. We will then send the winner variant to all the remaining members of your target audience.

Image showing the ability to select a winner from the A/B Test Report.

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Platform-specific instructions

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Create a Push A/B Test

  1. Go to Messages > Push > New Push
  2. Name your message (e.g., “Push AB Test - CTA Button”)
  3. Select your segment(s)
  4. Click the A/B Test button

Image showing A/B Test Button

  1. Add variants
  • Click Add Variant to duplicate and edit each new version.
  • Only change one variable at a time for meaningful insights.

Image showing how to add more variants

  1. A/B Test settings

Select the percentage of your target audience that should receive each variant. See How A/B Testing works for more details.

The percentage is applied to the total audience, evenly distributed across each variant. Examples:

  • 25% of a message with 2 variants will sent 12.5% to each variant.
  • 25% of a message with 10 variants will sent 2.5% to each variant.
  • 50% of a message with 2 variants will sent 25% to each variant.
  • 50% of a message with 3 variants will sent 16.67% to each variant.
  • 100% of a message with 2 variants will sent 50% to each variant.
  • 100% of a message with 4 variants will sent 25% to each variant.

Any percentage other than 100% will allow you to select a winner.

  1. Review results

View results under Messages > Push > A/B Tests Tab. Click any test to view variant-specific reports.

  1. Select a Winner

Use performance metrics to manually select a winner.

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Best practices for A/B Testing

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Understand benchmarks

Review past performance data so you can evaluate test success meaningfully.

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Set a goal and hypothesis

Clearly define what you’re testing and what success looks like.

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Change one variable at a time

Control your experiment by isolating variables like:

  • Subject lines
  • Layouts
  • CTA copy
  • Length of copy
  • Images
  • Offers
  • Emojis
  • Colors
  • Fonts
  • Icons
  • GIFs

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Use controls

Include your “usual” version as a baseline for measuring improvements.

Create control groups by tagging users randomly and exclude that segment. You can Export user data and create a segment from the CSV import.

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Test simultaneously

Send all variants at the same time to avoid timing bias.

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Continue testing

Iterate based on results to continuously optimize message performance.

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FAQ

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Can I A/B test different segments?

Not within the standard message form. However, you can test different segments using Journeys with Split Branches and Yes/No Branches.

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Can I automatically select a winner?

Not yet. You must manually choose the winning variant or use 100% to send all variants.

You’re done! You can now test different variants of your messages and select a winner.

Need help?

Chat with our Support team or email support@onesignal.com

Please include:

  • Details of the issue you’re experiencing and steps to reproduce if available
  • Your OneSignal App ID
  • The External ID or Subscription ID if applicable
  • The URL to the message you tested in the OneSignal Dashboard if applicable
  • Any relevant logs or error messages

We’re happy to help!