A/B test your Shopify theme
without rewriting it.

Yes. The app installs a theme app block that injects a small script in the head on every storefront page. Variants are driven by data attributes you add directly to your theme markup. There is no theme rewrite and no framework requirement.

No. Simple Split Testing works on every Shopify plan.

No. The script hides the page for the few hundred milliseconds it takes to fetch a visitor's assignment, then reveals it once the variant is applied. A safety timeout reveals the page if the fetch fails so a broken script can never keep your storefront blank.

On their first eligible page view, each visitor gets a sticky assignment for each active test. The assignment is cached in a 90-day first-party cookie and stamped onto their cart, so it survives page loads and the checkout. Orders are tied back via a cart attribute for revenue attribution within the cookie's lifetime.

Anything in your theme HTML. Headlines, hero images, button labels, prices, CTAs, banners, layout changes. You can swap entire elements, toggle CSS classes, or apply inline styles per variant. For inserted content, wrap it in a template tag and the script unwraps it for the assigned variant.

Rate metrics (conversion rate, add-to-cart rate) use a two-proportion z-test. AOV uses a Welch t-test. You pick the confidence level (90, 95, or 99 percent) when you create the test. Multi-variant tests get an automatic Bonferroni correction. The admin labels each variant as strong, moderate, low, or inconclusive, and tells you roughly how many more sessions to gather when the verdict is still moderate or low.

Yes. Visitors get an independent assignment for each active test, so two tests on the same page do not interfere. Plan limits apply to the number of concurrently active tests.

The embed script is small and the assignment lookup is cached. When no tests are running it short-circuits before any network call, so an installed-but-idle app costs you nothing on every page view.