Internally, Apple engineers rely on a dedicated app to view, manage, and toggle in-development features and user interface elements within pre-release versions of new operating systems. Here’s what the app is called and what it can do.
Livability is an internal app used by Apple engineers to manage new features
An essential internal-use application known as Livability lets the company’s software engineers keep track of individual operating system features and test devices as a whole. It can be found in InternalUI builds of iOS, a specialized variant of the iPhone‘s operating system that’s used internally for software development.
The application itself is a core component of Apple’s pre-release operating systems. With Livability, Apple’s software development and engineering teams can enable, disable, and debug upcoming features to make sure they are fully functional before their inevitable release to the general public.