iOS 9.3 adds numerous new features to Apple's mobile operating system including: Night Shift, secure Notes, more personalized News, an improved Health app, updates to CarPlay, and new Education features. More details on those features here.
OS X 10.11.4 brings secure notes, live photos to messages, and other stability/performance improvements. Apple has told testers to focus on iBooks, Messages, Notes, and Photos. It also updated the developer build of beta 3 to 15E39d.
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