Shopify Rollouts is a built-in system for preparing, scheduling, and testing changes to an online store before they go live permanently. Merchants can prepare seasonal updates, schedule launches at a specific time, and draft customisations directly on the published theme without spinning up duplicate themes. Launched as part of the Winter 2026 Editions update, it also introduces native split testing for stores on Advanced plans and above. This post covers how Rollouts works in practice, how to configure traffic splits, what can and cannot be tested, how to interpret the analytics, and how the related SimGym tool fits into the testing workflow.