https://www.theregister.co.uk/2017/10/12/ios_11_knackers_neglected_pure_connect_speaker_app/

Wireless speaker maker Pure appears to be more the first casualties in Apple's war on 32-bit iOS apps.

Pure's 32-bit Connect software for iThings won't work on Apple's new 64-bit-only iOS 11, meaning folks using Cupertino's latest firmware and handsets can't control their space-age hi-fis. The audio remote-control app joins various games, utilities and other 32-bit-only programs that are not allowed to run on iOS 11 and later.