When you download an app or open a web page, you might see a button that says "Sign in with Apple." This is Apple's alternative for those who rely on Facebook or Google to sign in to sites and apps (and connect those apps to social media).

In the iOS 13 preview at the June 2019 developer conference, Apple announced this single sign-on (SSO) service to compete with these other services.

Have you ever used Facebook or Google's SSO service to sign in to a website other than Google or Facebook? It is certainly convenient and can reduce your data exposure if one of those third party sites is compromised in a data breach. But for Facebook and Google, it would give them more insight into your online behavior, which they would use to sell advertising.

Apple's alternative SSO solution gives you the option to sign up for third-party sites and apps using a unique disposable email address that is automatically forwarded to your iCloud email address. Services and apps that use this feature will never know your real email address. [Carolina Milanesi of Creative Strategies told Tom's Guide when Apple first announced the feature. Giving users the option to log in and keep their data private will appeal to them."

The first step is to find a site or app that supports Sign in with Apple.

Apple does not provide a list of such sites and apps, but Reddit users do. Below is a list of apps supported by Sign in with Apple and a link to a list of Sign in with Apple supported websites.

When you download a site or app that supports Sign in with Apple, such as Kayak, a travel information finder, or Kitchen Stories, a recipe app, you will see a large button that simply says Sign In with Apple.

Then select the login option. Since you probably want to protect your privacy, we recommend tapping "Hide My Email."

In some apps, you can check your privacy by looking at where your email address appears after you sign in. Below is a dingy email address provided by Sign in with Apple.

Developer Ben Packard shares the numbers from his implementation of Sign in with Apple in his theater fan app Mezzanine.

He concludes his blog by saying. "It is clear from this comparison that Sign in with Apple appeals to people using Facebook and Google accounts. In my opinion, this is good news not only for Apple, but also for privacy-conscious developers and users.

Packard concluded by saying that if you were building an app from scratch today, Sign in with Apple would replace Facebook and Google authentication.

Several major companies offer Sign in with Apple support. Here is a list of the most well-known partners:

Sign in with Apple may not be a priority for developers, as it is a convenient feature for new users. I skip this option because when I re-download an app I already signed up for with an existing account, I want access to the data I previously entered.

If you want to use it for everything, you will need to stop using history with that company, but make sure you delete your existing account first.

Using the example presented by Craig Federighi, Apple's head of software engineering, at WWDC 2019 when Sign in with Apple was announced, a user named "Kim Kirgo" (there are Americans with this name on LinkedIn There are at least three of them) can register an account with Fretello, a guitar training app, using Sign in with Apple.

The fictitious Kim could use her real iCloud email address for this purpose by selecting "Share My Email" in the Sign in with Apple interface. I hope the email address that Fedelegi displayed on the screen is not the real Kim Kirgo's.

However, Kim could choose the "hide my email" option, in which case Frettero would receive "[email protected]" as her email address and Guitar Training Services would never know her actual Guitar Training Service will never know about her actual identity.

If Kim decides to delete Fretero's account, she will not forward emails sent to アップルは[email protected] to her iCloud address.

It has long been possible to sign up for an online account using a fake or discarded email address; services such as Mailinator, Guerrilla Mail, and E4ward offer this for free or for a small annual fee.

Even with Gmail, this can be done by adding text beginning with "+" to your regular Gmail address. For example, if you are John Smith and signed up for Dropbox, "[email protected]" に送られたメールは[email protected]. However, this is not exactly anonymous.

You could set up a completely random email address using Gmail or Yahoo Mail and have it forwarded to a different email address for each new account, but you would have to maintain those email addresses, at least nominally.

In most cases, these services work only through a web browser. Apple's new system is the easiest and most convenient way to set up disposable email addresses when dealing directly with smartphone applications.

Apple tells us, in part, that "customers only need to authenticate using their Apple ID, and Apple protects user privacy by providing developers with a unique random ID." "Sign in with Apple" can easily authenticate with Face ID or Touch ID instead of a password, the statement said, and "two-factor authentication is built in for enhanced security."

No iOS or macOS device is required to use Sign in with Apple, so Windows and Android users should also be able to use this feature if they have an Apple ID.

If you're wondering why you don't see Sign in with Apple in your favorite services, there's a reason for that. Sign in with Apple is a required feature for new apps (per Apple's updated App Store Review Guidelines), but developers of existing apps have until April 2020 to add this feature.