# Atchoo!

> Atchoo! is a Shopify app for A/B testing product page templates. Merchants build variant templates in their existing theme (no theme duplication, no code), Atchoo splits traffic deterministically 50/50, tracks product views and add-to-cart events first-party in real time, and calls winners with Bayesian analysis. Plans: Free ($0), Advanced ($9.99/mo), Pro with full A/B testing ($39/mo); 14-day free trial.

Key facts: template-level testing via Shopify's native template system; anti-flicker scoped only to tested product pages with a hard failsafe; first-party tracking through Shopify's app proxy (no third-party cookies); primary metric is add-to-cart rate. Atchoo does not test prices, shipping rates, or checkout.

## Guides

- [The Complete Guide to A/B Testing on Shopify](https://atchoo.app/blog/shopify-ab-testing-complete-guide): the pillar guide covering methods, statistics, and a 90-day roadmap
- [How to A/B Test Shopify Product Pages](https://atchoo.app/blog/how-to-ab-test-shopify-product-pages): step-by-step tutorial
- [All articles](https://atchoo.app/blog): the full blog

## Tools

- [Significance calculator](https://atchoo.app/tools/ab-test-significance-calculator): free two-proportion z-test
- [Sample size calculator](https://atchoo.app/tools/ab-test-sample-size-calculator): free sample size and duration estimator

## Comparisons

- [Best Shopify A/B testing apps](https://atchoo.app/compare/best-shopify-ab-testing-apps)
- [Atchoo vs Intelligems](https://atchoo.app/compare/atchoo-vs-intelligems)
- [Atchoo vs ABConvert](https://atchoo.app/compare/atchoo-vs-abconvert)
- [Atchoo vs Shoplift](https://atchoo.app/compare/atchoo-vs-shoplift)
- [Atchoo vs Trident AB](https://atchoo.app/compare/atchoo-vs-trident-ab)

## Product

- [Pricing](https://atchoo.app/pricing)
- [FAQ](https://atchoo.app/faq)