Xcode is Apple's integrated development environment (IDE). USAGE NOTE: Use this tag only for questions about the Xcode IDE itself, and not for general Mac or iOS programming topics. Use [cocoa] for Mac programming questions, and [cocoa-touch] or [ios] or [Swift] for iOS programming questions.Xcode is Apple's integrated development environment (IDE). USAGE NOTE: Use this tag only for questions about the Xcode IDE itself, and not for general Mac or iOS programming topics. Use [cocoa] for Mac programming questions, and [cocoa-touch] or [ios] or [Swift] for iOS programming questions.
SDK for Xcode 8 beta

iOS 10
macOS 10.12
watchOS 3
tvOS 10
This tag covers:

Project organization
Source code editing
Build system
Unit testing
Xcode instruments
Interface Builder (prior to Xcode 4, Interface Builder was a separate app, in which case you would use the