Swift 6.1.2

Online Swift Compiler & Editor

Name: myCompiler Swift
Author: myCompiler

myCompiler is a free online Swift compiler, editor and code runner that lets you write, run, and share Swift code directly in your browser. It works as your Swift playground, sandbox, fiddle, cloud compiler, and online REPL. No downloads, no installation needed. Just open the editor and start coding with syntax highlighting, autocomplete, and instant output.

Start coding in Swift How it works

27+ languages Used by 1M+ developers Free forever

main.swift

struct User {
    let name: String
    let age: Int
}

let users = [
    User(name: "Alice", age: 25),
    User(name: "Bob", age: 30),
    User(name: "Charlie", age: 35)
]

for user in users where user.age >= 30 {
    print("\(user.name): \(user.age)")
}

Output

Bob: 30 Charlie: 35

How to run Swift code online

Three steps to go from idea to running Swift code in this online playground. No account required.

Write your code

Open the Swift editor and start writing. The smart editor gives you syntax highlighting, autocomplete, and error detection as you type.

Click Run

Hit the Run button or press +Enter to run your Swift code on secure, sandboxed cloud servers.

See results

Output appears instantly in the integrated terminal. Errors and exceptions show up with clear, helpful messages.

Everything you need to code in Swift

A complete online Swift IDE and coding playground in your browser. Write, run, and share code without any setup.

Zero setup required

Start coding in seconds with this browser-based Swift interpreter. No downloads, no installations, no environment configuration. Open your browser, go to myCompiler, and start writing Swift code immediately.

Works on any device with a web browser. Desktop, laptop, tablet, phone, Chromebook. There is nothing to install and nothing to configure.

Feature-rich code editor

Write Swift with a professional-grade code editor built into your browser. Syntax highlighting colors your code for readability, making keywords, strings, and functions easy to distinguish at a glance.

Intelligent autocomplete suggests methods and properties as you type, and real-time error detection catches mistakes before you run your code.

Multi-file projects

Create and manage multiple files in a single project. Use the file sidebar to organize your code into modules, then import them across files just like in a desktop IDE.

Build modular applications with proper project structure. Each file is editable, and you can switch between them instantly.

Run code instantly

Click the Run button or press +Enter to execute your Swift code instantly. This online code runner displays output immediately in the integrated terminal panel. Your code runs on secure, sandboxed cloud servers and results appear in seconds.

Error messages and tracebacks are displayed clearly, making it easy to find and fix issues. The terminal supports ANSI colors for rich output formatting.

Ready to try it? Write and run your first Swift program in seconds.

Open Swift editor

Swift on myCompiler

myCompiler runs Swift 6.1.2, always up to date with the latest stable release. You get a full browser-based IDE with syntax highlighting, intelligent code completion, multi-file project support, a built-in terminal for real-time output, and standard input (stdin) for interactive programs. Write, compile, run, and debug Swift code on any device. Desktop, laptop, tablet, phone, Chromebook. Zero downloads, zero configuration, and no sign-up required. Save your programs with a unique URL and share them with anyone. You can also embed a working Swift editor on your own website.

Use this online Swift playground as a quick code executor for testing snippets, a coding sandbox for learning, or a cloud compiler for coding interview preparation. The editor includes dark mode for comfortable coding, keyboard shortcuts for faster workflows, and clear error messages with line numbers so you can debug quickly. Students use it for homework and practice. Teachers use it to share working examples. Developers use it to prototype ideas. myCompiler is beginner-friendly, fast, and completely free. It works in any modern web browser.

Start coding in Swift

Swift code examples

Common Swift patterns you can try in the online compiler. Each example is ready to run.

Hello World in Swift

main.swift

print("Hello, World!")

Variables and Data Types in Swift

main.swift

let name: String = "Alice"
var age: Int = 30
let height: Double = 5.6
let isStudent: Bool = true
print("\(name) is \(age) years old")

If-Else Conditionals in Swift

main.swift

let x = 10
if x > 0 {
    print("Positive")
} else if x == 0 {
    print("Zero")
} else {
    print("Negative")
}

For and While Loops in Swift

main.swift

for i in 1...5 {
    print("Count: \(i)")
}

let fruits = ["apple", "banana", "cherry"]
for fruit in fruits {
    print(fruit)
}

Functions in Swift

main.swift

func greet(_ name: String, greeting: String = "Hello") -> String {
    return "\(greeting), \(name)!"
}

print(greet("Alice"))
print(greet("Bob", greeting: "Hi"))

Arrays and Collections in Swift

main.swift

var fruits = ["apple", "banana", "cherry"]
fruits.append("date")
print(fruits[1])

var person: [String: Any] = ["name": "Alice", "age": 30]
if let name = person["name"] as? String {
    print(name)
}

Classes and Objects in Swift

main.swift

class Dog {
    let name: String
    let breed: String

    init(name: String, breed: String) {
        self.name = name
        self.breed = breed
    }

    func bark() -> String { return "\(name) says Woof!" }
}

let dog = Dog(name: "Rex", breed: "Labrador")
print(dog.bark())

Error Handling in Swift

main.swift

enum AppError: Error {
    case invalidInput(String)
}

func parse(_ s: String) throws -> Int {
    guard let n = Int(s) else {
        throw AppError.invalidInput("\(s) is not a number")
    }
    return n
}

do {
    let n = try parse("abc")
    print(n)
} catch AppError.invalidInput(let msg) {
    print("Error: \(msg)")
}

File I/O in Swift

main.swift

import Foundation

let content = "Hello, File!"
let url = URL(fileURLWithPath: "output.txt")

try! content.write(to: url, atomically: true, encoding: .utf8)
let read = try! String(contentsOf: url, encoding: .utf8)
print(read)

Optionals in Swift

main.swift

var name: String? = "Alice"

// Optional binding
if let n = name {
    print("Name is: \(n)")
}

// Nil coalescing
let display = name ?? "Unknown"
print("Display: \(display)")

// Optional chaining
name = nil
print("Length: \(name?.count ?? 0)")

Try these examples in the editor

How to take input in Swift online

myCompiler supports standard input (stdin) for Swift programs. Use Swift's standard input functions to read user input. Enter your input data in the stdin panel before running your program.

This works for both single-line and multi-line input. You can read strings and convert to numbers using the language's built-in I/O functions.

Try it yourself

main.swift stdin supported

let name = readLine()!
let age = Int(readLine()!)!

print("Hello \(name)!")
print("You'll be \(age + 1) next year.")

stdin

Alice
25

Output

Hello Alice!
You'll be 26 next year.

No setup, no sign-up. Start writing Swift code right now.

Start coding now

Getting started with Swift online

You can start writing and running Swift code right now without installing anything. Type your code, and click Run. This free Swift code runner executes your program instantly and displays the output in the terminal panel below the editor. Open the Swift online editor, type your code, and click Run.

If you're new to Swift, use this online Swift playground to start with the basics like variables, data types, conditionals, and loops. The code examples above cover all the fundamentals you need to get started. Each example can be copied into the sandbox and run immediately. No setup, no configuration.

As you progress, try creating multi-file projects, using libraries, and sharing your programs with others via URL. Sign up for a free account to save your work and build a personal library of programs. myCompiler works as a full online Swift IDE right in your browser.

Who uses myCompiler

Whether you're learning to code, preparing for interviews, or prototyping ideas, myCompiler is built for you.

Students & Learners

Practice exercises, complete homework assignments, and experiment with code without installing anything on school or personal computers.

Teachers & Educators

Share code examples with students via unique URLs. Embed the compiler in course materials so students can run examples directly in the browser.

Interview Candidates

Practice coding interview problems, test algorithms, and verify solutions quickly during preparation for technical interviews.

Professional Developers

Quickly prototype ideas, test code snippets, or try out a library without setting up a local environment. Great for quick experiments.

Content Creators & Bloggers

Embed interactive examples in blog posts, tutorials, and documentation so readers can run code without leaving the page.

Teams & Collaborators

Share code snippets with colleagues via URLs. Others can view, run, and fork your code to build on your work.

myCompiler vs. local IDE

Why use an online Swift compiler instead of installing one locally?

Feature	myCompiler	Local IDE
Setup time	Instant	Minutes to hours
Installation	None required	Swift + IDE required
Device support	Any browser	Desktop only
Sharing code	One-click URL	Manual (file, git, etc.)
Languages	27+ in one place	One at a time
Cost	Free forever	Free to $$$
Works on Chromebook	Yes	Limited

What is Swift?

Swift is a powerful, intuitive programming language developed by Apple and first released in 2014 as a modern replacement for Objective-C. Designed by Chris Lattner (creator of LLVM), Swift was built to be safer and more expressive than Objective-C while maintaining the same performance. In 2015, Swift was open-sourced, enabling its use on Linux and for server-side development.

Swift features optionals for safe nil handling, a powerful type inference system, value types (structs and enums) alongside reference types (classes), closures, generics, protocol-oriented programming, and async/await for modern concurrency. SwiftUI, Apple's declarative UI framework introduced in 2019, has made building iOS, macOS, watchOS, and tvOS apps significantly more productive.

What is Swift used for?

Swift is used for iOS app development, the primary language for building iPhone and iPad apps, macOS application development, watchOS and tvOS apps, server-side development with Vapor (a Swift web framework), SwiftUI cross-platform apps targeting Apple platforms, and increasingly for machine learning via Apple's Create ML and Core ML frameworks.

Swift for beginners

Swift is an excellent first language for anyone interested in iOS or macOS development. Its clean syntax, strong type system, and helpful compiler error messages make it approachable. Swift Playgrounds on iPad provides an interactive environment for learning Swift visually. Use myCompiler's online Swift compiler to learn Swift syntax, optionals, enums, structs, and protocols, without a Mac or Xcode, running Swift on Linux.

Swift vs other languages

Compared to Objective-C, Swift is dramatically more readable, safer (no null pointer exceptions with proper optional handling), and more expressive. Compared to Kotlin (Android's primary language), Swift and Kotlin share many design philosophies and parallel features, both are modern, safe, expressive languages for mobile. Compared to React Native or Flutter for cross-platform development, Swift is native-only (Apple platforms) but delivers the best performance and integration with Apple's frameworks.

Why use an online Swift compiler?

An online Swift compiler, also called a Swift playground or Swift sandbox, lets you compile and run Swift code directly in your browser without a Mac or Xcode. This is ideal for learning Swift syntax, practicing optionals and generics, understanding protocol-oriented programming, and experimenting with the Swift standard library for algorithms and data structures.

myCompiler's online Swift compiler runs Swift on Linux with the full Swift standard library. You can use Swift collections, generics, protocols, closures, async/await, and string processing. Save and share Swift programs via URL, all free.

Why is Swift so popular?

Swift's popularity is driven by Apple's ecosystem, with over 1 billion iPhones in active use and a multi-billion dollar App Store, iOS development is a massive industry. Swift has been consistently rated as one of the most loved languages in Stack Overflow's Developer Survey. Its open-source release and growing server-side ecosystem via Vapor are expanding Swift's reach beyond Apple platforms. SwiftUI's cross-platform support for all Apple devices has further solidified Swift as the language of Apple development.

Swift career opportunities

Swift expertise leads to iOS developer, macOS developer, mobile engineer, and Apple platform developer roles. iOS development is one of the highest-paid mobile specializations, the combination of Swift, UIKit/SwiftUI, and App Store publishing skills is in consistent demand across startups, agencies, and enterprise companies. Vapor knowledge adds server-side Swift opportunities.

Try Swift online Free · No sign-up needed

Keyboard shortcuts

Code faster with these keyboard shortcuts in the myCompiler editor.

Run code

+ Enter

Save program

+ S

Toggle comment

+ /

Indent line

Tab

Unindent line

Shift + Tab

Undo

+ Z

Select next occurrence

+ D

Find & replace

+ H

Embed the Swift compiler on your website

Add an interactive Swift compiler to your website, blog, or learning platform. Readers can write and run Swift code directly on your page without leaving it.

Perfect for technical tutorials, coding courses, documentation, and educational content. Save a program on myCompiler and use the embed link to add it to any webpage.

Embedded Swift compiler, editor and code runner

HTML

<iframe
src="https://www.mycompiler.io
    /embed/swift"
width="100%"
height="400"
frameborder="0">
</iframe>

Why developers choose myCompiler

A full-featured online IDE for Swift and 27+ other programming languages.

27+ Languages

Python, JavaScript, Java, C++, Rust, Go, TypeScript, C#, and many more. All compilers and interpreters in one place. Switch languages instantly.

Dark & Light Mode

Switch between light and dark themes with one click. Code comfortably in any lighting condition, day or night.

Mobile Friendly

Fully responsive editor optimized for phones, tablets, and Chromebooks. Code on any device with a web browser. No app download needed.

Save & Share Code

Save programs to your account, share via unique URLs, and let others view, fork, and run your code. Great for collaboration and code reviews.

Tags & Organization

Organize your saved programs with tags and find them quickly with search and filters. Build a personal library of code snippets and solutions.

No Account Required

Start writing and running code immediately. No sign-up, no email, no credit card. Create a free account later only if you want to save your work.

Explore more programming languages

myCompiler supports 27+ languages. Switch between them anytime. All free, all in one place.

View all 27+ languages

Frequently asked questions

Common questions about using the online Swift compiler, playground, and code runner.

Yes! myCompiler is completely free for all supported languages including Swift. There are no subscriptions, no premium tiers, and no hidden costs. Every feature is available at no charge.

myCompiler keeps its Swift environment up to date. You can see the exact version on the language details section of this page. We regularly update all language runtimes to their latest stable versions.

myCompiler runs Swift on Linux, so you can practice Swift syntax, data structures, algorithms, and core language features. While iOS-specific frameworks like UIKit are not available, it is ideal for learning Swift fundamentals.

Simply open the Swift editor, write or paste your code, and click the Run button. Your code will be executed on our servers and the output will appear in the terminal panel within seconds.

Yes. Click Save to store your program. You will receive a unique URL that you can share with anyone. Recipients can view, fork, and run your code.

Yes. myCompiler supports multi-file projects. You can create, rename, and delete files in the sidebar. This lets you organize your Swift code just like in a local IDE.

Yes. All code runs in isolated containers on our servers. Each execution gets its own sandboxed environment that is destroyed after completion. Your code cannot affect other users or our infrastructure.

Yes. myCompiler has a responsive design optimized for phones and tablets. You can write and run Swift code on the go. The mobile interface uses tabs for switching between the editor, output, and file panels.

Yes. Click the Input tab in the bottom panel, type or paste your input data, then click Run. Your program will read from the input you provided.

Execution is fast. Code runs on our optimized cloud infrastructure and output typically appears within seconds. Execution time depends on the complexity of your program.

Yes. myCompiler provides an embed feature. You can copy an iframe snippet and paste it into your website, blog, or documentation. Visitors can edit and run code directly on your page.

myCompiler supports common editor shortcuts including Run (Ctrl/Cmd+Enter), Save (Ctrl/Cmd+S), Find (Ctrl/Cmd+F), and more. See the keyboard shortcuts section on this page for the full list.

No. myCompiler requires an internet connection because code is compiled and executed on our cloud servers. The editor itself loads in your browser, but running code requires connectivity.

myCompiler offers a fast, free, zero-setup environment with a modern code editor, multi-file support, dark mode, and instant sharing. It is ideal for learning, prototyping, interviews, and sharing code examples.

Yes. myCompiler is great for practicing algorithms and coding problems. You can write Swift code, provide custom input, and test your solutions instantly. Save your work and come back to it anytime.

Use print statements or console output to trace your program's behavior. myCompiler shows all standard output and error messages in the terminal panel. Error messages include line numbers to help you locate issues.

Ready to write Swift code?

Open the free Swift playground and start coding immediately. No downloads, no account required.

Start coding in Swift

Free · No sign-up required · Swift 6.1.2