While the lure of free apps is strong, "cracked" software is a primary vector for security threats.

: A massive, independent marketplace for iOS and macOS. It hosts a vast library of "cracked" and community-uploaded IPA files.

: Requires a PC or Mac. You install AltServer on your computer, connect your iPhone, and "sideload" the AltStore app. From there, you can download IPA files from the web and "install" them via AltStore.

: This was another platform that offered a range of apps, including some that were cracked. However, its popularity and availability have fluctuated over the years.