Developer Data

Ruby Gems 2.6.0 Ruby Gems 2.6.0 is the system-wide folder where macOS stores Ruby libraries and command-line packages installed for Ruby 2.6. /Library/Ruby/Gems/2.6.0

Opt The /opt folder stores optional third-party software and shared command-line tools installed outside Apple’s standard system locations. /opt

Node Modules ~/node_modules stores JavaScript packages installed by Node.js tools and projects so apps, scripts, and build workflows can use their dependencies. ~/node_modules

Android ~/Library/Android stores Android SDK files and related developer data used by Android Studio, command-line tools, and the Android Emulator on macOS. ~/Library/Android

Devices Simulator Data ~/Library/Developer/CoreSimulator/Devices stores per-device data for Apple Simulator, including apps, settings, and files used by Xcode test devices. ~/Library/Developer/CoreSimulator/Devices

Virtual Machines Localized Virtual Machines.localized is a home-folder location used on macOS to store virtual machine bundles, disk images, snapshots, and related files. ~/Virtual Machines.localized

Developer The /Library/Developer folder stores Apple developer tools and shared build resources used by Xcode and Command Line Tools on macOS. /Library/Developer

Zsh Sessions ~/.zsh_sessions stores per-session Z shell history and restore data used by Terminal on macOS to track commands across shell sessions. ~/.zsh_sessions

Uv ~/.cache/uv stores downloaded and reusable cache data for uv, a Python package and project manager used to speed up installs, environments, and tool runs. ~/.cache/uv

Virtual OS Container This folder stores sandboxed data for virtualOS, a macOS app used to create and run virtual macOS machines on Apple Silicon Macs. ~/Library/Containers/com.github.yep.ios.virtualOS

Npm ~/.npm stores npm cache files and related data used by the Node.js package manager to download, verify, and reuse JavaScript packages. ~/.npm

Rustup ~/.rustup stores Rustup toolchain data, including installed Rust versions, components, and configuration used to manage Rust on your Mac. ~/.rustup

node-gyp User Caches ~/Library/Caches/node-gyp stores downloaded Node.js header files and other temporary build data used when node-gyp compiles native addons on a Mac. node-gyp · ~/Library/Caches/node-gyp

Xcode Junk Xcode Cache ~/Library/Caches/com.apple.dt.Xcode stores temporary cache data used by Xcode to speed up development tasks, indexing, and other project-related work. Xcode Junk · ~/Library/Caches/com.apple.dt.Xcode

Xcode Junk Documentation Cache ~/Library/Developer/Xcode/DocumentationCache stores Xcode documentation data so Apple developer docs can load faster inside the IDE. Xcode Junk · ~/Library/Developer/Xcode/DocumentationCache

Xcode Junk Derived Data ~/Library/Developer/Xcode/DerivedData stores Xcode build products, indexes, and other generated project data used to speed up compiling and debugging. Xcode Junk · ~/Library/Developer/Xcode/DerivedData

Xcode Junk Archives ~/Library/Developer/Xcode/Archives stores Xcode build archives (.xcarchive) that developers use to validate, export, and distribute app builds. Xcode Junk · ~/Library/Developer/Xcode/Archives

Xcode Junk iOS Device Support ~/Library/Developer/Xcode/iOS DeviceSupport stores iPhone and iPad device support files that Xcode uses for on-device development, debugging, and symbol handling. Xcode Junk · ~/Library/Developer/Xcode/iOS DeviceSupport

Xcode Junk Simulator Runtimes ~/Library/Developer/CoreSimulator stores Xcode Simulator device data and runtime support files used to run iPhone, iPad, watch, TV, and visionOS simulators. Xcode Junk · ~/Library/Developer/CoreSimulator

clang Var Folders Cache This folder stores temporary clang compiler data in macOS /private/var/folders, where builds and developer tools keep short-lived working files. clang · /private/var/folders/jb/4mnygrgj01bdk1z6p5jgsl480000gn/C/clang

Xcode Junk Xcode Cache ~/Library/Caches/com.apple.dt.Xcode stores Xcode cache data that helps Apple’s development tools open projects, index code, and reuse temporary build information. Xcode Junk · ~/Library/Caches/com.apple.dt.Xcode

DerivedData DerivedData is the Xcode working folder that stores intermediate build products, indexes, logs, and other generated developer files for projects. Xcode Junk · ~/Library/Developer/Xcode/DerivedData

Archives ~/Library/Developer/Xcode/Archives stores Xcode build archives created when you archive apps for distribution, export, debugging, or release history. Xcode Junk · ~/Library/Developer/Xcode/Archives

iOS DeviceSupport iOS DeviceSupport stores Xcode device support files and symbols used when connecting, debugging, and symbolicating logs from iPhone and iPad devices. iOS Device Support · ~/Library/Developer/Xcode/iOS DeviceSupport

CoreSimulator ~/Library/Developer/CoreSimulator stores Xcode simulator device data so developers can run and test apps in simulated iPhone, iPad, watch, TV, and Vision devices. Simulator Devices · ~/Library/Developer/CoreSimulator