If you’ve already started using your iPhone, you’ll need to either set it up as new again (which will delete everything on it), or you can sync Google. This is an official Apple app and is completely free.
Continue through the first few screens of the setup on your iPhone. You’ll be selecting your language and region, setting up Wi-Fi, enabling location services, and setting up your Touch ID and passcode. Proceed until you reach the Apps & Data screen
Make sure you want until the iPhone says it’s complete. The Android device may indicate the process is complete before it actually is.
This includes creating an Apple ID if you don’t have one. If you don’t have an Apple ID yet, it’s recommended that you create one so that you can use the App Store, iTunes, iCloud, Find My iPhone, and more. Make sure to enter a valid email address so that you can verify your account. You can use any email address to create your ID, including your Gmail account. Creating an Apple ID will allow your iPhone to match the apps you had on your Android and download any available free iPhone versions. Paid apps will be added to your App Store wishlist, as they’ll need to be purchased again for iPhone.
To do this on Android, open Settings in your app list, tap Accounts > Google and select your Google account. Finally, scroll down and toggle on the switch next to Keep to enable syncing. On your iPhone, go to Settings > Notes > Accounts and tap the Google account, or tap Add Account and add your Google account. Finally, make sure the switch next to Notes is enabled (green) and Notes will sync.
Check out How to Use Google Keep to learn more about using Google Keep as your new notetaking app.