The Accounts framework provides access to user accounts stored in the Accounts database. An account stores the login credentials of a particular service, such as Twitter, that can be used as authentication for the service. By implementing the Accounts framework into your app, you do not need to be responsible for storing account logins yourself. Instead, the user can grant access for your app to use their account login credentials, bypassing the need to type their username and password. If no account for a particular service exists in the user’s Accounts database, you can let them create and save an account from within your app.

The Address Book framework provides access to a centralized contacts database, called the Address Book database, that stores a user’s contacts. Applications such as Mail and Messages use this database to present information about known and unknown persons.

The Address Book UI framework provides controllers that facilitate displaying, editing, selecting, and creating records in the Address Book database.

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The Ad Support framework provides apps with access to an identifier that can be used only for serving advertisements, as well as a flag which indicates whether a user has limited ad tracking. Accessing the advertising identifier requires apps to read and honor the opt-out flag.

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The AV Foundation framework provides an Objective-C interface for managing and playing audio-visual media in iOS and OS X applications.

The Greystripe iOS SDK provides a simple way to monetize your iOS applications via in-application ads. Once integrated with the iOS SDK, your application will communicate with Greystripe’s Ad Network to retrieve and display ads. Greystripe handles all ad sales, both in the US and internationally, and provides comprehensive back-end accounting and reporting.

The iOS SDK provides Facebook Platform support for iOS apps.