Many people speak more than one language and use different languages in different contexts. Devices and platforms that can run apps generally ask the user to select one language for the system and then make the apps follow suit. For mobile phones, in particular, users may prefer certain apps to run in a language other than the system's language; Apple introduced a per-app language setting in iOS a while ago. Android app developers, however, had to implement a custom solution within their apps if they wanted to provide this option — until now. Android 13 introduced a new system setting, per-app language preferences, and a public API, making it easier for developers to offer this feature. For backward compatibility, equivalent APIs are available in AndroidX via AppCompatDelegate. We encourage developers to replace their custom solutions and instead use this feature in their apps.