# SimGym correlates 0.7 with real add-to-cart, but App Store rating hits 2.9 stars - Date: 2026-04-22 - Category: Artificial Intelligence Shopify open-sourced its internal ML pipeline engine and showed 5x search gains. Now it is opening a customer simulator to merchants — with a 2.9-star App Store rating and a self-reported 0.7 correlation stat that has not been independently verified at merchant scale. ---