Apple Inc. develops many apps for iOS that come bundled by default or installed through system updates. Several of the default apps found on iOS have counterparts on Apple's other operating systems such as macOS, iPadOS, watchOS, and tvOS, which are often modified versions of or similar to the iOS application. As each app is integrated into the operating system itself, they often feature greater support for system features than third-party alternatives and are quick to adapt new features of iOS.