AltServer

About

AltServer is the macOS companion app for AltStore, the app store designed for sideloading on iOS. The website lists AltServer for macOS, which requires macOS 11 or later, and notes that for macOS 10.14 and 10.15 users should consult the FAQ. The site states that AltStore Classic requires AltServer to install.

AltStore is presented as a way to discover and install apps that may not be available on Apple's App Store. Apps in AltStore get detailed store pages, users can browse apps from trusted developers or add additional "sources," and the store lists app permissions and alerts users if they change. Anyone can also publish apps by hosting a source file that users add to AltStore.

The website describes AltStore as an open-source project developed by a small team and says AltStore, Delta, and Clip are properties of AltStore LLC, with no association with Nintendo or Apple. The website does not describe AltServer's specific functions beyond its role in installing AltStore Classic.