What is AppSync Unified?

AppSync Unified is a tweak that patches installd to allow for the installation of unsigned, fakesigned, or ad-hoc signed IPA packages on an iOS device.

When AppSync Unified is installed, it “patches installd” so that the certificate don’t expire and you can “download fakesigned IPAs” directly from your iPhone or iPad (via Safari). If there is any developer out there who want to test out their apps before submitting it to the App Store, AppSync can aid your development by allowing installation of self-signed iOS apps.
Thus, AppSync is very important for every iOS version such as iOS 8, iOS 7, iOS 6, and iOS 5 because it signs every cracked apps and make it available to your device. How to Install AppSync iOS 8 from Cydia. These are the few easy steps on how to install AppSync iOS 8 from Cydia.

AppSync dynamic library for iOS 4 ONLY. This is the last version of 'AppSync for iOS 4.0' that Hackulous released before they shut down. This package contains an unmodified copy of AppSync for iOS 4.0, and it functions the same just as the original from Hackulous did. It will still work as well as it did before on iOS 4. AppSync 5.5 released for iOS 11 – Download now AppSync Cydia tweak is a must have for jailbreak users specially for them who use vShare, 25PP and other in-app cracker Cydia apps. Recently, the new version of this tweak introduced to power iOS 11 named AppSync Unified 5.5. IOS 11 AppSync Unified 5.5 is compatible.

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.

AppSync Unified should not be used to pirate iOS apps. Please support iOS app 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.

Official Cydia Repository

You can find AppSync Unified at Karen's Repo: https://cydia.akemi.ai/ (depiction page)

If you do not see AppSync Unified in Karen's Repo, then that just means you have another repository added that is also hosting an identical copy of AppSync Unified. Please only use the official unmodified release for your own safety — third-party modifications can and have caused damage to iOS installations.

How does it work?

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.

Can't this be used to pirate apps?

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!

How do I compile AppSync Unified?

How do I use this with Xcode to push my developed apps to my device?

For Xcode 7 and above, simply use your device with Xcode as you would normally.

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For Xcode 6 and below, please follow this tutorial: Tutorial: How to use AppSync Unified for development with Xcode 6 or below

License

Licensed under GPLv3.

One of the more common questions we’ve been getting here at iDB since the release of the Yalu jailbreak for iOS 10 is when AppSync Unified, from Karen Tsai (angelXwind), would be getting an update to make it compatible with the new jailbreak.

As you may be aware, many people got themselves into a respring loop of some description by installing AppSync soon after the Yalu jailbreaks came out. That should now have been fixed with this new beta version of AppSync Unified, available on Karen’s Cydia repository.

What is AppSync?

AppSync is a powerful tweak which allows the installation of unsigned .ipa files (iOS applications) on your jailbroken device. Whilst it is true that this functionality is often used for nefarious purposes, the central intent of AppSync is valid and useful. It allows on-device installation of legal apps for those without a Mac or Xcode, as well as the distribution of legal but unsigned apps by those who cannot make it onto the App Store, for example, emulator applications.

However, it can be (and is) unfortunately also used for the installation of paid apps for free. For more information on the real purpose of AppSync and the reasoning behind its legitimate uses, you can read Tsai’s post on the subject.

I personally use it to install emulators such as GBA4iOS, as well as older versions of applications for legacy devices, which are no longer available from the App Store.

Appsync For Ios 11

AppSync in beta for iOS 10

The new build number is 6.0~b1, and the changelog consists of one major item to prevent crashes on, and bring compatibility to, iOS 10:

Appsync For Ios 10

Return the public “Apple iPhone OS Application Signing” intermediate certificate instead of “kSecMagicBytes” on iOS 10 to avoid a Security.framework crash — thanks JulioVerne!

Tsai goes into more detail as to what caused the problem in her announcement post, but the basic premise is that AppSync gives fake data to the installd process in order to sign your unsigned apps, however, on iOS 10 this causes the Security.framework to crash installd. Then, when Cydia installs a package and runs uicache it calls on installd, which crashes, leaving your SpringBoard in a half-way, broken state: a respring loop.

In fixing this problem, Tsai was helped out by developer and software-cracker JulioVerne. Much had been wildly speculated about whether the two were in ‘competition’, after Tsai initially advised against installing his fixed-up version. However, this turned out to be incorrect, as explained by Tsai in the announcement post I linked above.

To summarise: the two have worked together to bring this solution, with JulioVerne providing his source code for the fix. This allowed Tsai to check its legality (it uses an Apple certificate), and restore iOS 5 & 6 support, which the initial fix unwittingly broke. She has now been able to release an official version of the package, which fixes all these issues and can prevent version fragmentation, by being offered on her official repo. She credits JulioVerne with the fix, and thanks him for his help.

If you want to try out the beta of AppSync Unified, it can be found on Karen Tsai’s Pineapple repo: https://cydia.angelxwind.net/

Appsync Repo

Please ensure that the only version you install is the one from this repository. Installing an older version could leave you in the respring loop, and many repositories offer old versions of this package. Install AppSync Unified 6.0~b1 only from Karen’s Pineapple repo.

Appsync For Ios 6

Are you excited to have AppSync Unified on iOS 10? Have you tried it out yet?