Jarstak is a visual A/B testing editor for e-commerce teams. Point, click, and edit any element on your live store — headlines, buttons, prices — and turn it into a statistically valid test in minutes. No developer needed. No native module to install. Deploys via GTM on any stack — Shopify, WooCommerce, PrestaShop, SPA, SSR. Built GDPR-first: first-party variant assignment only, no third-party cookies. Available in 6 languages. Priced for small teams, not enterprises.