: The dylib must be present at an absolute path on the device (e.g., /Library/MobileSubstrate/DynamicLibraries/my.dylib ). This is why this method is common in jailbreak tweaks.
Alternatively, you can use a tool like install_name_tool to update the load libraries:
Now use optool to add the LC_LOAD_DYLIB command to the app's main executable: Inject Dylib Into Ipa
The ecosystem relies on both open-source and commercial tools:
After making changes to the IPA, you need to resign it with a valid signature. You can do this using ldid: : The dylib must be present at an
iOS will crash any application containing an unsigned binary component or a component signed with mismatched keys. Therefore, both the injected dylib and the parent application must be signed. Step 3.1: Sign the Dylib Individually
| Tool | Description | Platform | |------|-------------|----------| | | A user-friendly sideloading application that includes built-in dylib injection as an advanced option. | macOS, Windows | | Esign | An on-device IPA signing and injection tool that allows tweak injection directly on iOS. | iOS | | EasySignIpa | A Python-based command-line tool for re-signing and injecting libraries into IPA files. | macOS | | iReSignDylib | A Mac GUI application that provides a visual interface for dylib injection and re-signing. | macOS | | mlinject | A Python tool that automates dylib injection and optionally injects hooking libraries like ellekit or CydiaSubstrate. | Cross-platform | | TrollFools | An on-device injection tool based on insert_dylib and ChOma technology for iOS. | iOS | You can do this using ldid: iOS will
⚠️ : Injecting dylibs into apps you do not own or have explicit permission to test violates copyright laws, end-user license agreements (EULAs), and potentially computer fraud statutes. This guide is for educational and authorized security testing only.