Make sure your app is ready for iPhone Duo on day one. Run the app resizability skill, fix layout patterns, and test resizing to help your app shine.

Phone Duo will be available to customers starting October 23, 2026. To get your apps and games ready today, you can:Build or ...

We give developers powerful APIs to build incredible capabilities into their apps for Apple products, backed by a set of ...

The original Developer ID Certification Authority (Sub-CA) expires on February 1, 2027. Certificates issued by this authority will stop working on that date.What to do: Check if you’re affected. In ...

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The beta versions of iOS 27.2, iPadOS 27.2, macOS 27.2, tvOS 27.2, visionOS 27.2, and watchOS 27.2 are now available. Get your apps ready by confirming they work as expected on these releases. And ...

As part of agreements with select European competition authorities, Apple is introducing changes to its App Tracking Transparency framework in the European Union. Beginning with iOS 27.2 and iPadOS 27 ...

Discover how you can expand the reach of your subscriptions with new features in iOS 27. You can start preparing today by making sure your apps use StoreKit 2 to handle your Apple In-App Purchases.

Sign up for new Group Labs to ask questions, get answers, and follow the discussion about all things Duo. Explore best practices, templates, and specifications for ...

Start getting ready for iPhone Duo today. Watch new videos, sign up for Group Labs, and take part in Q&As on the Apple Developer Forums.