Apple today shared a news update encouraging developers to update their Apple Watch apps for watchOS 4. The update also shares that watchOS 1 apps will no longer be accepted next year.
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Apple notes the benefits that come along with updating apps for watchOS 4.
Take advantage of increased performance, new background modes for navigation and audio recording, built-in altimeter capabilities, direct connections to accessories with Core Bluetooth, and more. In addition, the size limit of a watchOS app bundle has increased from 50 MB to 75 MB.
The deadline for all Apple Watch apps to be native (built with the watchOS 2 SDK or later) will be April 1st next year.
Please note that starting April 1, 2018, updates to watchOS 1 apps will no longer be accepted. Updates must be native apps built with the watchOS 2 SDK or later. New watchOS apps should be built with the watchOS 4 SDK or later.