AppSync Unified is a tweak that patches installd to allow for the installation of fakesigned IPA packages on an iOS device.
AppSync Unified can be used to downgrade or clone installed apps, to download fakesigned IPAs (often emulators), and also to assist in the development of iOS applications using Xcode 6 or below.
AppSync Unified should not be used to pirate iOS apps. Please support iOS developers and do not pirate!
I explain the problem with AppSync Unified and iOS piracy rather thoroughly in this reddit post. Please give it a read.
You can find AppSync Unified at Karen's Pineapple Repo: https://cydia.angelxwind.net/ (depiction page)
If you do not see AppSync Unified in Karen's Pineapple Repo, then that just means you have another repository added that is also hosting an identical copy of AppSync Unified.
AppSync Unified utilizes the dynamic hooking function MSHookFunction() in Cydia Substrate to bypass installd's signature checks. This means AppSync Unified does not modify any system files and is much more stable and safe as a result.
Unfortunately, yes.
I explain the problem with AppSync Unified and iOS piracy rather thoroughly in this reddit post. Please give it a read.
tl;dr: AppSync Unified should not be used to pirate iOS apps. Please support iOS developers and do not pirate!
Many other "AppSync"-esque packages found on various piracy-centered repos are actually all mirrors/repacks of "PPSync," an... incredibly strange installd patch made by the notorious Chinese iOS piracy website, 25pp.
25pp's version of AppSync, "PPSync," modifies installd's launch daemon plist file to interpose its signature checking routines, which is an ugly workaround and extremely unstable, causing system apps to randomly crash, among other undesirable behaviour.
Even more baffling is how PPSync's postinst creates symbolic links of all system applications to /User/Applications/, which causes a multitude of problems.
tl;dr: AppSync Unified is much more stable than anything else you'll find out there.
git clone https://github.com/angelXwind/AppSync.git
cd AppSync
make
make package #requires dpkg, install using Homebrew - see http://brew.sh/
Read this: Tutorial: How to use AppSync Unified for development with Xcode 6 or below
Licensed under GPLv3.