You don't need to use the app for QC35, I didn't know about it till I had them for a month. The reason I got the app is because it does firmware updates. They'

You don't need to use the app for QC35, I didn't know about it till I had them for a month. The reason I got the app is because it does firmware updates. They've released quite a few updates to improve audio quality, noise cancelling, and compatibility with some devices.