WatchOS 4.3.1 beta warns that watchOS 1 apps won't work on future versions Credit: Apple

WatchOS 4.3.1 beta warns that watchOS 1 apps won't work on future versions

If you're using an old Apple Watch app that hasn't been updated in a while, you might run into some problems when watchOS 5 lands (likely sometime this fall). The latest beta of watchOS 4.3.1, which is sort of the watchOS equivalent of iOS 11.4, warns you when you try to launch an out-of-date app.

"This app will not work with future versions of watchOS. The developer of this app needs to update it to improve its compatibility."

That's the warning that pops up on your Apple Watch when you try to run an older app made for watchOS 1. That doesn't mean watchOS 4.3.1 will break your old apps, but watchOS 5 almost certainly will.

The impact on you at home: This break with compatibility for the very first version of watchOS is an indication that Apple intends to keep rushing forward with Apple Watch, and that watchOS 5 will be more than just a minor upgrade. Typically, dropping support for old apps and the APIs they use is done to remove overhead and cruft as the company replaces those functions within the operating system. That, together with security concerns, are the two most likely reasons for cutting off support for apps made to run on an operating system only a few years old.

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