tl;dr: Shopify is migrating its mobile apps from React Native back to native Swift and Kotlin, reversing its 2020 decision because LLMs have eliminated the main cost advantage of a shared codebase—agents can now implement, translate, and test features across platforms efficiently. The company is rebuilding apps greenfield using an internal tool called Helix that breaks migrations into reviewable checkpoints, and has already shipped a native rewrite of the Shop app in 12 weeks. Shopify will wind down or hand off its React Native open-source libraries (Skia, FlashList, Restyle) through 2026.