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To identify the iOS SDK recorded in an existing app, inspect the app’s main executable and read its Mach-O build metadata. Look for the sdk field in LC_BUILD_VERSION (or, in older binaries, check for an LC_VERSION_MIN_* command). That value is not the same as the app’s minimum supported iOS version, and it does not by itself prove the exact Xcode release. If you have the project or archive, its build-specific records and resolved settings can provide additional evidence.
Check an installed app or IPA
You need access to the app bundle’s executable. For an IPA, unpack the archive and locate the application’s .app directory. The commands below assume macOS and Apple’s developer tools are available; use each tool’s local help or man page if its syntax differs on your system.
- Find the app bundle and inspect its Info.plist. Run
plutil -p path/to/App.app/Info.plist. Note the value ofCFBundleExecutable, which names the main executable. The plist also includes fields such asMinimumOSVersion,CFBundleShortVersionString, andCFBundleVersion, but those are not SDK identifiers. - Inspect the executable’s load commands. Run
otool -l path/to/App.app/AppName, replacingAppNamewith the value fromCFBundleExecutable. FindLC_BUILD_VERSIONand read itssdkfield. If available,vtool -show-build path/to/App.app/AppNamecan display build-version information in a more focused form. - Check older binaries for legacy metadata. If there is no
LC_BUILD_VERSION, look for anLC_VERSION_MIN_*load command. Legacy commands may provide a minimum OS version and SDK version, but they do not have the same modern build-version metadata. - Inspect other components separately. If the bundle includes app extensions or embedded frameworks, locate and inspect each component’s executable. A package can contain binaries built at different times or with different settings.
The command examples reflect standard Mach-O inspection practice. The available documentation for vtool’s load-command description is a third-party mirror of an Xcode manual page, rather than a current Apple Developer page, so confirm details against the tools installed on your Mac.
Tell the SDK, minimum OS, and app version apart
These values answer different questions. In particular, a minimum deployment version is not evidence of which SDK compiled the app.
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| Value | What it tells you | What it does not tell you |
|---|---|---|
Mach-O sdk |
The SDK version recorded in that executable’s build metadata. | It does not, by itself, establish one unique Xcode release. |
Mach-O minos or legacy version; plist MinimumOSVersion |
The minimum operating-system version required by the app or component. Xcode’s processed Info.plist maps the deployment target to MinimumOSVersion (Apple’s MinimumOSVersion documentation). |
The SDK used to compile the binary. |
CFBundleShortVersionString |
The user-facing app or bundle version. | The SDK or Xcode version. |
CFBundleVersion |
The bundle’s build-version identifier (Apple’s CFBundleVersion documentation). | The compiler or Xcode version. |
| Current resolved Xcode build settings | The effective settings for the selected project, target, configuration, and SDK. | Proof of the settings used to produce an older distributed binary. |
Use the project or archive for build-specific evidence
Inspect resolved settings in Xcode
In Xcode, select the relevant target and configuration, open Build Settings, and inspect the resolved values for the relevant SDK. Build settings can be inherited or overridden at the target, project, configuration-file, and system-default levels, so a project-level value alone may not reflect the value used for a particular build. Apple describes how Xcode resolves build settings in its build-settings documentation.
Current settings are useful when you can reproduce a build. They are weaker evidence for an older app because the project, configuration files, or defaults may have changed since that binary was made.
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Keep the archive and build records
For command-line builds, select the intended Xcode developer directory and use Apple’s xcodebuild command-line tool. xcresulttool can inspect result bundles. Preserve the archive and build log associated with the exact build when you need provenance; Apple documents these tools in its Xcode command-line tool reference.
For an uploaded build, App Store Connect’s Build Metadata page can show device requirements, including minimum iOS version. That helps confirm deployment compatibility; the documentation reviewed for that page does not establish it as a source for the SDK or exact Xcode release.
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Can the SDK version identify the exact Xcode release?
Not reliably on its own. The SDK recorded in a binary can help narrow down a likely toolchain, but it is not conclusive proof of a unique Xcode version. Apple’s Xcode and SDK compatibility table lists SDKs included with Xcode releases; consult the current table when comparing a recorded SDK with possible releases. The table changes over time, and an SDK match should be reported as a likely match rather than build provenance.
For a defensible answer, compare the executable’s platform and component, its SDK and minimum-OS fields, and any archive or build records tied to that build. Modern Mach-O metadata may also record tool information, but the available load commands and level of detail vary by binary and toolchain.
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When the metadata is missing or unclear
- If the executable has no recognizable SDK field, report that the artifact does not establish the SDK rather than inferring it from
MinimumOSVersionor the app’s version strings. - If the main executable and an extension or framework show different metadata, report the values for each component instead of assigning one value to the whole package.
- If you only have the current project, describe its present resolved settings as current project settings—not as proof of how a previously distributed app was built.
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