Download Xcode 10.3 For Mac
You may have to sign up for a free Apple Developer Account in order to download Xcode 10 from the developer link that BDAqua provided — unless Apple has relaxed its access privileges for these tools.
Xcode 10.1 vs (Incompatible) Xcode 10.2.1 Step 2: Open the app directory (right click-show package contents) of your xcode 10.2.1 app. Navigate to Xcode 10.2.1.app/Contents/ and edit the file Info.plist, change the Minimum System Version to 10.13.6 (it should have.
Alternatively, If all you want is a a compilation environment for Objective-C, C++, and Swift v4.n, the Command Line Tools (macOS 10.13) for Xcode will provide that at 7GB less storage. You would then need a competent programmer's editor, and you can still build hand-coded cocoa applications. This is my preference.
Additional Downloads
Get the latest beta and older versions of Xcode. To view downloads, simply sign in with your Apple ID. Apple Developer Program membership is not required.
Beta Versions of Xcode
Command Line Tools & Older Versions of Xcode
Videos
See the latest advances in Xcode presented at WWDC and other events.
Download Xcode 10.3 For Mac Windows 10
Help and Support
Get step-by-step guidance on how to use Xcode to build, test, and submit apps to the App Store.
Xcode Help Guide
Xcode Support Page
API Reference and Sample Code
Browse the latest documentation including API reference, articles, and sample code.
Download Xcode 10 For Mac
Discussion Forums
Xcode 10 Download For Mac
Ask questions and discuss development topics with Apple engineers and other developers.