What Should You Use A/B Testing For? (Shopify Edition)

If you’ve ever wondered what you should test on your Shopify store — you’re not alone. Many merchants know that A/B testing can boost conversions, but don’t know where to start or what to test first.

In this post, we’ll break down the most impactful areas to A/B test, how to choose the right experiments, and why testing with a tool like Theme Scientist makes all the difference.

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Why A/B Testing Matters for Shopify Merchants

A/B testing lets you make data-driven decisions instead of relying on gut feelings or copying what competitors are doing. It answers questions like:

• “Does this CTA convert better than the old one?”
• “Will a shorter product description boost mobile engagement?”
• “Should I move the reviews higher on the page?”

Even small design or copy tweaks can lead to big gains in conversion rate, AOV, and retention — if you test smart.

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What Should You Use A/B Testing For? Top Ideas by Page Type

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Homepage

Your homepage is often your first impression — and testing here can have a ripple effect throughout your entire store.

Test ideas:

• Hero banner images or videos
• Headline variations (value prop, urgency, or social proof)
• CTA button text or colors
• Featured product layouts (grid vs carousel)
• “Free Shipping” bar messaging or placement

Goal: Improve time on site and first click-through.

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Product Pages (PDP)

This is one of the most important places to run tests. It’s where decisions happen.

Test ideas:

• Product title formatting
• “Add to Cart” button color, size, or placement
• Review stars above the fold vs below
• Price display (crossed-out original, % saved, bundle offers)
• Image order or product video placement
• Urgency or scarcity messaging (e.g. “Only 2 left!”)

Goal: Increase add-to-cart rate and conversion rate.

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Cart Drawer or Cart Page

Many Shopify stores overlook this — but testing in the cart flow can prevent drop-off right before checkout.

Test ideas:

• Free shipping progress bars
• Product upsells or cross-sells
• Showing discount codes vs hiding them
• Displaying trust badges or testimonials
• Simplifying the cart UI for mobile

Goal: Reduce cart abandonment.

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Checkout (Shopify Plus only)

For Shopify Plus users who can customize the checkout, this is prime real estate for testing.

Test ideas:

• Trust badges and guarantees
• Short vs detailed order summaries
• One-page vs multi-step checkout (if using custom checkouts)
• Progress indicators or delivery timelines

Goal: Improve checkout completion rate.

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Mobile vs Desktop UX

Always test across devices. Mobile often makes up 70%+ of Shopify traffic, but what works on desktop doesn’t always win on mobile.

Test ideas:

• Sticky add-to-cart buttons
• Accordion vs full text product descriptions
• Button placement (thumb-friendly zones)
• Hiding non-critical content

Goal: Optimize mobile-specific experience.

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Popups and Email Capture

Don’t just throw up a popup and hope it works. A/B test it.

Test ideas:

• Timing (5 seconds vs scroll-triggered vs exit intent)
• Discount vs free gift incentive
• Headline or CTA wording
• Image vs plain-text look
• Multi-step (Yes/No) popup vs single field

Goal: Increase email sign-up rate without hurting bounce rate.

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How to Choose What to Test First

Testing everything at once? Bad idea. You need a strategy.

Start with:

• Pages with the most traffic (usually homepage or PDP)
• Elements closest to conversion (like ATC buttons, pricing, checkout flow)
• Low-performing areas (bounce rate high? Start there.)

Use Shopify Analytics or GA4 to identify these spots.

💡 Bonus: Unexpected A/B Test Ideas

Looking to go deeper? Try these underutilized test ideas:

• Pricing formats: “$39.99” vs “Only $39.99” vs “$39”
• Testimonials vs Reviews: Which builds more trust?
• FAQ placement: Does adding FAQ to PDP reduce support tickets or increase conversion?
• Sort order on collection pages
• Visuals with models vs product-only
• Cart total vs itemized discount at checkout

Each of these can uncover surprising insights about your customers.

🧪 Use Theme Scientist to Test Smarter, Not Harder

Testing doesn’t need to be technical, expensive, or time-consuming.

Theme Scientist is the Shopify A/B testing app built for merchants like you. It lets you:

• Run tests without duplicating themes
• Quickly preview and publish variants
• See conversion data and confidence scores in real time
• Optimize layout, messaging, popups, cart drawers, and more

📌 Try Theme Scientist free for 14 days →

📌 Final Thoughts: What to Use A/B Testing For

A/B testing is one of the highest ROI activities you can do for your Shopify store — if you know what to test and how to analyze the results. Use it to:

✅ Understand your customers

✅ Reduce bounce and drop-off

✅ Improve conversions with data, not guesses

✅ Continuously evolve your store without risky redesigns

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