For the next two weeks, you won't be able to sync notes between iOS 9 and OS X. Here's a workaround.
If you've recently upgraded to iOS 9, you may find that you can no longer sync your beautiful new Notes app with your Mac. This is because on OS X Yosemite, your Notes app is still the same sad, pre-attachment version that you had in iOS 8—and they can't talk to each other.
Good news: OS X El Capitan has an iOS 9-compatible Notes app. Bad news: OS X El Capitan doesn't ship until September 30.
But don't worry, friends: You don't have to rush to install the OS X El Capitan beta if you're relying on getting your notes from iOS to OS X. Instead, you can use iCloud.com for your syncing needs. Unfortunately, this does only talk from iOS 9 to iCloud.com—so you'll have to do your notes-writing in one of those two places, and leave the OS X Notes app alone until you upgrade to OS X El Capitan.
Note: This only works for Notes you're syncing through iCloud.com; if you're syncing them through a different service, you won't be able to see them.
How to view iOS 9's Notes on a Mac running OS X Yosemite
- Open Safari on your Mac.
- Visit iCloud.com and enter in your username and password.
- Click on the Notes app.
From there, you should be able to edit your current notes, add checklists and text, and delete any unwanted information.