Sign in with Apple: What It Is and How It Works

 In iOS 13, Apple introduced a new Sign in with Apple feature, designed to allow you to build app and website accounts using your Apple ID, so you don't have to give your personal details away.

Signing in with Apple is an alternative to the current Google and Facebook sign-in services that are mostly provided by applications and websites. The version from Apple preserves your privacy and also allows you to mask your email address.


How Sign in with Apple Works

In an app that supports Sign in with Apple, there's a "Continue with Apple" option that you'll see when asked to create an account.

Tapping "Continue with Apple" explains that the feature is designed to allow you to sign in with the "Apple ID" you already have on websites. Developers don't see your Apple ID and only your name and email address are given, although there is also an option to hide your email address if desired.

Apps and websites get no personally identifiable information from you. When you use the feature, apps receive a unique identifier that is distinct for each developer, so there's no cross-platform or cross-app tracking available.


With Sign in with Apple, developers and websites have no way of gathering information about you beyond the name that you provide and your email address, unless it's hidden.

Hiding Your Email Address

When using Sign in with Apple, you can provide developers and websites with your email address, or you can use a hidden email address assigned by Apple that will then forward incoming correspondence to your real email address.
If you choose to use your real email address, you can use any email associated with your ‌Apple ID‌.

If you choose to hide your email address, Apple generates a unique email address that developers and websites can communicate with. Apple deletes messages after delivery or after a short while if undeliverable.

Sign in with Apple Developer Requirements

Apple is requiring all apps that offer sign in with Google, sign in with Facebook, or sign in with Twitter options to also offer Sign in with Apple, but there is a June 2020 deadline, so the feature may not be available in apps right away. Eventually all apps that allow you to sign in with other accounts from Google, Twitter, and Facebook will also be required to offer Sign in with Apple.

Apps are not required to use Sign in with Apple as an option if signing in with a username and password is available, though developers certainly can if they choose to.

Websites aren't required to use Sign in with Apple, but the option is available, and apps that also have websites do have Sign in with Apple implemented.

Where Sign in with Apple Works

Sign in with Apple works on the web and in iOS and Android apps. So if you have a login for an app that also has a website, you can use Sign in with Apple as a log in option in both places.

Using Sign in with Apple on the Web

When you use Sign in with Apple on the web, websites will request your ‌Apple ID‌ to log in, but the entire authentication process is handled by a separate window and done through Apple so the website never sees your ‌Apple ID‌. Web access allows Sign in with Apple to be used on any device.

How to Change Your Forwarding Email

If you're signing into an app, Apple uses your default ‌Apple ID‌ email address, but if you're signing into a website, you can change your associated email address for forwarding purposes.


To do so, open up the Settings app, choose your Apple account (your picture) and then select Name, Phone Numbers, and Email.

Converting an Existing Login to Sign in with Apple

Some apps and websites will allow you to convert an existing login to Sign in with Apple, but the process for this will vary from service to service. Whether or not a specific app or website allows a login to be converted also depends on whether or not the feature has been implemented.

Signing in on a Public Computer

If you're using a public computer or a work computer to access a Sign in With Apple website, you can follow the same general steps for logging in on a website on your Mac. Click on the "Sign in With Apple" option on a supported website, and then enter your ‌Apple ID‌, password, and then enter the two-factor authentication code on an approved device.

Biometric Authentication

Apple protects your Sign in with Apple logins with Touch ID, Face ID, and passcode options so no one can sign in to your accounts but you. Biometric options are used where available, such as on iPhones, iPads, and Macs, with passwords used on Macs that don't have biometric authentication options.

Two-Factor Authentication

On the web, all of your Sign in with Apple logins are protected by two-factor authentication, so you will need to confirm with a verified device just like you would when signing into iCloud on a new device. Two-factor authentication is required to use Sign in with Apple.

Managing Your Sign in with Apple Data

Apple maintains an on-device list of all of the apps and websites where you've used Sign in with Apple. Open up the Settings app, tap on your profile, choose Password & Security, and then tap on the "Apps Using Your ‌Apple ID‌" option.

Apple doesn't track what apps you're using or where you have accounts, but Apple says that information about your ‌Apple ID‌ and your device use patterns could be used to help Apple prevent fraud. Developers do not see any data from you that you don't provide.


Privacy

Apple doesn't track what apps you're using or where you have accounts, but Apple says that information about your ‌Apple ID‌ and your device use patterns could be used to help Apple prevent fraud. Developers do not see any data from you that you don't provide.

Apple shares a "easy numerical ranking" with the developer the first time you sign up for an app or website to show you're a real user. The score is calculated from recent behaviour of the Apple account and "abstracted data about your computer and use habits."

Apple says it knows whether you have activated an app or a website to sign in with Apple, but it does not monitor the apps you sign in to or when. Apple does not see or maintain a history of what applications or websites you are logging in to or using Sign in with Apple, nor does it obtain this information from developers.

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