Adding Klaviyo's tracking script to the header increased conversion rates and revenue. Discover the impact of this simple code addition.
Enhanced mobile filters increase conversions and revenue


IF we add the Klaviyo tracking script to the header, THEN conversions will increase, BECAUSE it enhances email click attribution.
The Klaviyo tracking script was added to the website header to improve email click attribution and enhance the connection between email marketing campaigns and on-site conversions.
The Results
We dig through every data source to map what's actually broken. By the end, there's no confusion.
Lift in conversion rate
Change in amount of orders
Change in revenue per visitor
Adding the Klaviyo tracking script delivered a +5.0% conversion rate lift and +1.40% revenue increase. The improved email attribution likely helped Klaviyo better identify returning email subscribers, enabling more targeted follow-up and re-engagement. The slight -2.4% AOV dip suggests the additional conversions may have come from lower-value orders driven by email campaigns, but the net revenue impact was still positive. A simple, low-risk change with meaningful upside.
Detailed results breakdown
Add-to-cart rate change
+0.8%
Average order value
-2.4%
Click-through rate change
+0.2%
Lift in conversion rate
+5.0%
Change in revenue per visitor
+2.5%
Start with 3 experiments.
Zero cost.
Get a taste of our service. We'll analyze your store, pinpoint low-hanging fruit, design, implement and test solutions to lift your conversion rate in 30 days.
Who qualifies?
30,000+ Monthly sessions.
Minimum traffic needed to run statistically significant tests.
Running on Shopify or Shopify Plus.
Our specialty - we don't work with other platforms.
Investing in paid traffic.
We work with stores committed to growth, not hobbyists.
Ready to invest in systematic CRO.
You understand testing takes time - no magic bullets.
Why free?
The best proof is results. Three real experiments show you exactly how we work and whether it drives revenue for your specific store. You keep everything - no strings attached.
Our bet
We're confident enough in our process to invest our time upfront. If the tests work, you'll see the value in continuing at $5,950/month. If not, you got free optimization work.
Limited spots
We take only 4 free trials monthly to maintain quality. Each trial gets our full attention and expertise. If you qualify, secure your spot before this month fills up.
Other experiments we've run

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+3.68% (CVR) CVR

Product Page (PDP)
Simplified Product Descriptions
Marsh Wear tested simplifying product descriptions to see if it would impact sales. The result was flat conversion with a slight RPV gain.
+1.78% (CTR) CTR

Search & Navigation
Repositioning “Hats” to top-level navigation increases visibility and user efficiency
Marsh Wear Clothing tested spotlighting the Hats category. Discover how this affected user interaction and sales.
-9.4% Clickthrough rate