On the down side, anyone with access to my iPhone can also open this app and take a look at any secret recipes I've written down or other personal information I'd never want to share. Fortunately, Apple's iOS 9.3 update remedies this by allowing users to lock particular notes with a password or Touch ID.
How to Lock Your Notes
Locking a note is an extremely simple process, but again, it's only available for iOS 9.3 (currently in public beta right now). To lock a note, simply tap the share icon from within a note you've taken and select "Password Protect Note" from the share sheet.
Next, create a password and include a hint so you don't forget it. As mentioned, you can also toggle on "Use Touch ID," which will make it more secure. Once you're ready, tap "Done." The password you create will also be applied to additional notes you decide to lock in the future.
How to Unlock Notes
To unlock a note, which you can also view on Macs running OS X 10.11.4 and later, tap on "View Note" and use your fingerprint or password to unlock it.
If you forget your password, you'll receive your hint after several failed attempts.
If you completely forget the password you created, you can enter the Notes preferences from within Settings to reset it using your device's main passcode, which does not delete your protected notes. Additionally, you can also toggle off Touch ID or change the password from the preferences as well.
Although I'm still waiting to lock apps on my iPhone, this is definitely a great addition and a step forward for iOS. If you like the new feature, let us know by commenting below.