What AltStore does
AltStore lets iPhone and iPad users install compatible IPA files with an Apple ID signing flow. It is commonly used for apps distributed outside the App Store by independent developers and repository maintainers.
Before installing
Check the official AltStore instructions for the current desktop requirements, supported iOS versions, and refresh behavior. Requirements can change, so use iappstores as an app discovery index and the official project as the installation source of truth.
Finding apps
After AltStore is set up, use category, repository, and app pages on iappstores to compare available IPA listings, source notes, version dates, and compatibility fields before opening an external download source.