UK Marketing New Requirements for watchOS Apps: Apple Confirms Full 64-Bit Adoption Starting April 2026

Apple has introduced an important update for watchOS app developers. Starting in April 2026, all watchOS apps submitted to App Store Connect will need to support 64-bit architecture and be developed using the watchOS 26 SDK.

This shift is designed to boost app performance and drive technological advancements for Apple Watch applications, offering developers both opportunities and challenges.

64-Bit Support Becomes Mandatory

From April 2026 onward, watchOS apps must incorporate 64-bit support to successfully pass the App Store Connect review. This mandate ensures that apps are fully compatible with the 64-bit architecture, keeping pace with Apple Watch’s evolving hardware and future capabilities.

Must Be Built with watchOS 26 SDK

Developers will also be required to use the watchOS 26 SDK when building their apps. This SDK provides the latest tools and APIs tailored for 64-bit architecture, enabling developers to optimize app performance and enhance the overall user experience.

How to Implement 64-Bit Support

To meet these requirements, Apple advises developers to utilize Xcode’s default "Standard architectures" build setting. This configuration produces a single binary with 64-bit code, streamlining development while ensuring compliance with the new standards.

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Testing ARM64 Compatibility

Developers can verify ARM64 compatibility by testing their apps in the Xcode Simulator. For real-device testing, compatible models include Apple Watch Series 9, Series 10, SE (2nd generation), and Ultra 2, running either watchOS 11 or the watchOS 26 beta, to ensure optimal performance.

Editor’s Comments

This policy reflects a strategic enhancement for the watchOS ecosystem, with the complete transition to 64-bit architecture promising improved app efficiency and expanded functionality. As Apple Watch hardware progresses, developers are urged to adopt these changes early to avoid submission issues.

The introduction of the watchOS 26 SDK also signals exciting new possibilities, encouraging developers to refine their apps and maintain a competitive edge.