Kshitij Singh
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Kotlin to Swift: A Comprehensive Guide


Transitioning from Kotlin to Swift can be a daunting task, but it is essential for developers working across Android and iOS platforms. This guide will help you understand the key differences and similarities between Kotlin and Swift, making the transition smoother. What is Kotlin? Kotlin is a statically typed programming language developed by JetBrains. It is fully interoperable with Java and is used primarily for Android development.

What is Swift?

Swift is a powerful and intuitive programming language developed by Apple. It is used for iOS, macOS, watchOS, and tvOS app development. Key Differences Between Kotlin and Swift


Kotlin and Swift have different syntax rules. For example, Kotlin uses val and var for declaring variables, while Swift uses let and var. Null Safety Kotlin has built-in null safety features, whereas Swift uses optionals to handle null values.


Kotlin is fully interoperable with Java, making it easier to integrate with existing Java code. Swift, on the other hand, is designed to work seamlessly with Objective-C.

Similarities Between Kotlin and Swift

Modern Language Features Both Kotlin and Swift offer modern language features like type inference, higher-order functions, and lambda expressions.

Open Source

Both languages are open-source, allowing developers to contribute to their development and use them freely. Kotlin to Swift: Code Examples Variable Declaration
  • Kotlin: val name: String = "John"
  • Swift: let name: String = "John"


  • Kotlin:
    fun greet(name: String): String {
      return "Hello, $name"
  • Swift:
    func greet(name: String) -> String {
      return "Hello, \(name)"

Tools for Conversion

Several tools can help you convert Kotlin code to Swift, such as:
  • J2ObjC: A Google tool that translates Java source code to Objective-C.
  • Swiftify: An online tool for converting Objective-C code to Swift.
  • According to a 2021 survey, 60% of Android developers use Kotlin.
  • Swift is the 8th most popular programming language according to the TIOBE index.


Think of Kotlin and Swift as two different dialects of the same language. While they have different words and grammar rules, they both aim to achieve the same goal: effective and efficient app development. FAQ What are the main differences between Kotlin and Swift?

Kotlin uses val and var for variables, while Swift uses let and var. Kotlin has built-in null safety, whereas Swift uses optionals.

Can I use Kotlin for iOS development?

Yes, Kotlin/Native allows you to use Kotlin for iOS development, but it is not as mature as Swift.

Is Swift easier to learn than Kotlin?

Both languages have a learning curve, but Swift is often considered easier for beginners due to its simpler syntax.

Are there any tools to convert Kotlin code to Swift?

Yes, tools like J2ObjC and Swiftify can help in converting code between these languages.

  1. Kotlin Official Documentation - Comprehensive guide to Kotlin.
  2. Swift Official Documentation - Official Swift documentation by Apple.
  3. Swiftify - Tool for converting Objective-C code to Swift.

By understanding the key differences and similarities between Kotlin and Swift, you can make a smoother transition between these two powerful programming languages.

Free AI based kotlin to swift code converter Online