Shopify how-to June 16, 2026 4 min read
How to A/B Test Size Charts in Shopify
Find the variant that converts. Three tools: app A/B mode, dedicated split-test apps, GA4 experiments.
What to Test
Display mode (popup vs tab vs sticky button), unit default (cm vs inch), input style (measurements vs body type quiz), placement (above vs below add-to-cart), confidence indicator ("true to size" badge yes/no).
Tracking the Right Metric
Add-to-cart rate is fast feedback. Return rate is the real ROI signal — needs 30+ days. Track both. The variant winning add-to-cart sometimes loses on returns (e.g., recommender that pushes everyone to size up).
FAQs
How to A/B test size charts?
App A/B mode, dedicated apps, or GA4 experiments.
What to test?
Placement, unit default, display style.
Built-in A/B testing
Tailor Size Guide ships with one-toggle A/B testing.