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Kotlin VS Swift

Compare Kotlin VS Swift and see what are their differences

Kotlin logo Kotlin

Statically typed Programming Language targeting JVM and JavaScript

Swift logo Swift

Swift is a general-purpose, multi-paradigm, compiled programming language developed by Apple Inc. for iOS, macOS, watchOS, tvOS, Linux and z/OS.
  • Kotlin Landing page
    Landing page //
    2023-05-09

We recommend LibHunt Kotlin for discovery and comparisons of trending Kotlin projects.

  • Swift Landing page
    Landing page //
    2023-07-24

We recommend LibHunt Swift for discovery and comparisons of trending Swift projects.

Kotlin features and specs

  • Interoperability
    Kotlin is fully interoperable with Java, which means developers can use both languages within the same project and have seamless communications between them.
  • Conciseness
    Kotlin reduces boilerplate code, making the codebase easier to read and maintain. It offers concise syntax and reduces the amount of code.
  • Null Safety
    Kotlin's type system is designed to eliminate null pointer exceptions by making all types non-nullable by default, thus enhancing reliability and reducing runtime crashes.
  • Coroutines
    Kotlin provides built-in support for coroutines, which makes writing asynchronous code more straightforward and readable compared to traditional approaches.
  • Modern Language Features
    Kotlin includes advanced features such as lambda expressions, extension functions, higher-order functions, and more, improving productivity and providing more expressive code constructs.
  • Full Tooling Support
    Kotlin is supported by major IDEs like IntelliJ IDEA, Android Studio, Eclipse, and others, with full tooling support including debugging, refactoring, and linting.
  • Community and Ecosystem
    Kotlin has a growing and vibrant community with extensive resources, libraries, and frameworks that support a wide range of programming needs.

Possible disadvantages of Kotlin

  • Learning Curve
    Despite its modern features, Kotlin has a learning curve, especially for developers who are more familiar with Java or other programming languages.
  • Compilation Speed
    Kotlin's compilation speed is often slower compared to Java, which can impact the development workflow, especially in larger projects.
  • Runtime Performance
    While Kotlin performs comparably to Java in many cases, there can be minor performance hits in certain scenarios due to additional language features.
  • Fewer Resources Compared to Java
    Although growing, Kotlin's ecosystem of libraries and frameworks is still smaller compared to Java's well-established and extensive ecosystem.
  • Tooling Maturity
    While support in major IDEs is robust, some third-party tools and plugins may not fully support Kotlin, leading to potential integration issues.
  • Android Specific Challenges
    In the context of Android development, some legacy libraries and tools might not be fully compatible with Kotlin, necessitating additional workarounds.
  • Job Market
    While demand for Kotlin developers is growing, Java still dominates the job market, which may limit opportunities for Kotlin-focused roles in certain regions.

Swift features and specs

  • Performance
    Swift is designed to be high-performance, often running faster than Objective-C due to its modern language constructs and optimized LLVM compiler.
  • Safety
    Swift includes features like optionals, type inference, and safe memory management to reduce common programming errors and crashes.
  • Readability
    Swift's syntax is clean and less cluttered, making it easier to read and maintain.
  • Interoperability
    Swift is fully interoperable with Objective-C, allowing for easy integration with existing iOS and macOS projects.
  • Modern language features
    Swift includes modern programming concepts such as closures, generics, and tuples which can help developers write expressive and efficient code.
  • Memory management
    Swift uses Automatic Reference Counting (ARC), which helps in efficient memory management without requiring manual intervention from the developer.
  • Active community and support
    Swift has a large, active community and strong support from Apple, ensuring continuous evolution and community-driven improvements.

Possible disadvantages of Swift

  • Newness
    Being relatively new compared to languages like Objective-C, Swift is still evolving, which might lead to occasional stability issues or breaking changes with new updates.
  • Limited legacy support
    Swift does not work with versions of iOS and macOS older than iOS 7 and OS X 10.9, limiting its use in maintaining really old applications.
  • Learning curve
    For developers accustomed to Objective-C or other languages, there is a learning curve associated with familiarizing themselves with Swift’s new syntax and features.
  • Smaller pool of third-party libraries
    Although growing, the ecosystem of third-party libraries for Swift is still smaller compared to more mature languages, potentially limiting immediate availability of tools.
  • Binary compatibility
    Binary compatibility issues can arise, especially when working with a mixed codebase of Swift and Objective-C, requiring extra caution during implementation.
  • Tooling maturity
    Some of the development tools and environments, while robust, can still be less mature compared to the well-established Objective-C tooling.

Kotlin videos

10 reasons to try Kotlin for Android development

More videos:

  • Review - What can Kotlin do for me? (GDD Europe '17)
  • Review - Java or Kotlin for Android Development – Which One Is Better?

Swift videos

Honest Review of Swift and First Year Pay

More videos:

  • Review - Maruti Suzuki Swift - Hindi Review - Autoportal
  • Review - 2018 Maruti Swift Review - Still Fun To Drive | Faisal Khan

Category Popularity

0-100% (relative to Kotlin and Swift)
Programming Language
68 68%
32% 32
OOP
80 80%
20% 20
Generic Programming Language
Programming
0 0%
100% 100

User comments

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Reviews

These are some of the external sources and on-site user reviews we've used to compare Kotlin and Swift

Kotlin Reviews

Explore 9 Top Eclipse Alternatives for 2024
Cross-platform development with variants targeting JVM (Kotlin/JVM), JavaScript (Kotlin/JS), and native code (Kotlin/Native).
Source: aircada.com
Top 10 Rust Alternatives
The last computer programming language to stand out as an exceptional alternative to Rust is named Kotlin. It is typed statically and was manufactured for Java machines.

Swift Reviews

Top 10 Rust Alternatives
Swift also stands to be among the general-purpose computer languages used to generate codes. The basics of this language are based on a safer approach for the users.
The 10 Best Programming Languages to Learn Today
With the growing popularity of Apple operating systems and applications, having Swift programming skills under your belt is a wise investment. Swift shares some similar characteristics with programming languages Ruby and Python.
Source: ict.gov.ge

Social recommendations and mentions

Based on our record, Kotlin should be more popular than Swift. It has been mentiond 81 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.

Kotlin mentions (81)

  • Doodle Weather Clone
    Doodle helps you create beautiful, modern apps entirely in Kotlin. Its render model is intuitive yet powerful, making it easy to achieve complex UIs with pixel level precision and layouts. This simplicity and power applies to everything from user input to drag and drop. Doodle lets you build and animate anything. - Source: dev.to / about 2 months ago
  • Kotlin vs. Java: A Grand Finale and Farewell (But Not Goodbye!)
    Kotlin Official Website: Your one-stop shop for all things Kotlin, with comprehensive documentation, tutorials, and resources: https://kotlinlang.org/. - Source: dev.to / 6 months ago
  • Day 0 of #100daysofMiva || Setting up for success
    Next, I selected the technologies and frameworks I want to focus on during this challenge. For frontend development, I'll be exploring Reactjs, Vue.js, Bootstrap, Next.js, and MUI. For backend development, I'll be diving into Express, Django, Node.js, PHP, and Firebase. Additionally, I'll be learning Kotlin, React Native, and Flutter for mobile development, and APIs, PostgreSQL, Cloud, and MongoDB for full stack... - Source: dev.to / 9 months ago
  • Better Animations... in Latest Doodle
    Doodle helps you create beautiful, modern apps entirely in Kotlin. Its render model is intuitive yet powerful, making it easy to achieve complex UIs with pixel level precision and layouts. This simplicity and power applies to everything from user input to drag and drop. Doodle lets you build and animate anything. - Source: dev.to / 10 months ago
  • The Top Programming Languages to Learn in 2024
    Kotlin, fully interoperable with Java, is increasingly used for Android app development. It offers a more concise syntax and improved safety features compared to Java, making it a modern language for mobile development. Discover more about Kotlin here. - Source: dev.to / 10 months ago
View more

Swift mentions (30)

  • Migrating Away from Rust
    It surely is, according to Apple's own documentation. > Swift is a successor to the C, C++, and Objective-C languages. It includes low-level primitives such as types, flow control, and operators. It also provides object-oriented features such as classes, protocols, and generics. -- https://developer.apple.com/swift/ If developers have such a big problem glueing C libraries into Java JNI, or Panama, then maybe game... - Source: Hacker News / 5 days ago
  • Apple's Darwin OS and XNU Kernel Deep Dive
    Yes, Apple themselves, apparently folks wanting Apple to use Rust don't read Apple's documentation or watch talks done by Apple compiler developers. > Swift was designed from the outset to be safer than C-based languages, and eliminates entire classes of unsafe code. -- https://www.swift.org/about/ > Swift is a successor to the C, C++, and Objective-C languages. It includes low-level primitives such as types, flow... - Source: Hacker News / 28 days ago
  • The Top Programming Languages to Learn in 2024
    Swift is Apple's programming language for iOS, macOS, watchOS, and tvOS app development. It's known for its performance and safety, making it a great choice for developing apps in the Apple ecosystem. Explore Swift here. - Source: dev.to / 10 months ago
  • Swift was always going to be part of the OS
    The raisons d'être between the CLR (and C#) and Swift are entirely different. Apple has explicitly set out to adopt swift as a successor language to C, Objective-C, C++, and Objective-C++[0][1]. This stands in stark contrast to Microsoft's vision for the CLR, which was… to be a better Java, more or less? (Does anyone actually know what the .NET initiative was all about? Microsoft went absolutely ham on it... - Source: Hacker News / over 1 year ago
  • Local Dev Meetup
    What part of the coding universe are you interested in? Swift? React? Fission Ecosystem? Source: over 1 year ago
View more

What are some alternatives?

When comparing Kotlin and Swift, you can also consider the following products

Python - Python is a clear and powerful object-oriented programming language, comparable to Perl, Ruby, Scheme, or Java.

C++ - Has imperative, object-oriented and generic programming features, while also providing the facilities for low level memory manipulation

JavaScript - Lightweight, interpreted, object-oriented language with first-class functions

Elixir - Dynamic, functional language designed for building scalable and maintainable applications

Dart - A new web programming language with libraries, a virtual machine, and tools

Perl - Highly capable, feature-rich programming language with over 26 years of development