Swift Playground

Write, run, and share code snippets — no setup required.

main.swift

Alice
30

Output

Click Run to see the output here.

let name = readLine()!
let age = Int(readLine()!)!
print("Hello, \(name)! You are \(age) years old.")

Run Swift online in your browser

A free online Swift playground and compiler. Write Swift in your browser, hit Run, and swiftc compiles and executes your program in seconds. No Xcode, no Mac, no Swift Package Manager to set up first.

The editor is built on the same engine as VS Code, so Swift syntax highlighting, autocompletion, and diagnostic squiggles all work. Code compiles with Swift 6.0 on Debian with a pre-warmed module cache — Foundation is imported out of the box, so String/Array/Dictionary/Date/URLSession and the rest of the standard library are ready. Good for learning Swift without a Mac, prepping for an iOS interview, or exploring protocols and generics.

What makes this Swift playground useful

Instant Swift compilation — swiftc compiles your program with a pre-warmed module cache and runs it in seconds, no Xcode or swift package init needed.
Full Swift syntax highlighting, autocompletion, and clear swiftc diagnostics, powered by the same editor engine as VS Code.
Stdin input is supported. readLine() and FileHandle.standardInput both read from the playground's input box, so Swift command-line programs and interview problems work end-to-end. No Xcode, Mac, or Swift toolchain on your end.
Swift 6.0 toolchain with Foundation — compile Swift programs, use structs, protocols, generics, and async/await without needing a Mac or Xcode.

What you can build in the Swift playground

Optionals, guard let, and if let: the null-safety idioms that make Swift safe, runnable without any UIKit or SwiftUI boilerplate.
Structs, classes, enums with associated values, and protocols with associated types: the core of Swift's type system, testable one declaration at a time.
Quick Swift experiments: test a property wrapper, verify an async/await flow, try a result builder, or confirm how a generic where clause narrows.

Online Swift playground FAQ

Is the online Swift playground free?

Yes, the Swift playground is free to use. No sign-up, no Xcode, no Mac, and no Swift toolchain to install — open the page and compile.

Do I need Xcode or a Mac installed?

No install needed. You don't need Xcode, a Mac, or a local Swift toolchain. The online Swift compiler compiles your code with Swift 6.0 on Debian and runs it in seconds. Windows and Linux users can write and test Swift here without any platform-specific setup.

Does the Swift playground work on mobile and Chromebooks?

Yes. The Swift playground runs in any modern browser, on desktop, tablet or mobile. Good for writing Swift from a Chromebook, iPad, or any machine that can't run Xcode.

Can I readLine() in the online Swift playground?

Yes. readLine() and FileHandle.standardInput read your typed lines the same way they would when you run a compiled Swift binary locally and type at the terminal. Good for interview-style problems and CLI tools, with no Mac required.

How do I learn Swift after trying the playground?

Edit the sample Swift code, press Run, and iterate. When you want something more structured, Coddy's interactive Swift course covers optionals, structs, classes, protocols, generics, and async/await with hands-on exercises — a solid base whether you're aiming at iOS or server-side Swift.