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Kotlin
Kotlin

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Kotlin vs Swift: What are the differences?

Kotlin: Statically typed Programming Language targeting JVM and JavaScript. Kotlin is a statically typed programming language for the JVM, Android and the browser, 100% interoperable with Java; Swift: An innovative new programming language for Cocoa and Cocoa Touch. Writing code is interactive and fun, the syntax is concise yet expressive, and apps run lightning-fast. Swift is ready for your next iOS and OS X project — or for addition into your current app — because Swift code works side-by-side with Objective-C.

Kotlin and Swift can be primarily classified as "Languages" tools.

"Interoperable with Java" is the primary reason why developers consider Kotlin over the competitors, whereas "Ios" was stated as the key factor in picking Swift.

Kotlin and Swift are both open source tools. Swift with 48.4K GitHub stars and 7.76K forks on GitHub appears to be more popular than Kotlin with 28.3K GitHub stars and 3.28K GitHub forks.

Uber Technologies, Slack, and Lyft are some of the popular companies that use Swift, whereas Kotlin is used by Slack, 9GAG, and Rainist. Swift has a broader approval, being mentioned in 993 company stacks & 541 developers stacks; compared to Kotlin, which is listed in 268 company stacks and 208 developer stacks.

What is Kotlin?

Kotlin is a statically typed programming language for the JVM, Android and the browser, 100% interoperable with Java

What is Swift?

Writing code is interactive and fun, the syntax is concise yet expressive, and apps run lightning-fast. Swift is ready for your next iOS and OS X project — or for addition into your current app — because Swift code works side-by-side with Objective-C.
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What are some alternatives to Kotlin and Swift?
Scala
Scala is an acronym for “Scalable Language”. This means that Scala grows with you. You can play with it by typing one-line expressions and observing the results. But you can also rely on it for large mission critical systems, as many companies, including Twitter, LinkedIn, or Intel do. To some, Scala feels like a scripting language. Its syntax is concise and low ceremony; its types get out of the way because the compiler can infer them.
Java
Java is a programming language and computing platform first released by Sun Microsystems in 1995. There are lots of applications and websites that will not work unless you have Java installed, and more are created every day. Java is fast, secure, and reliable. From laptops to datacenters, game consoles to scientific supercomputers, cell phones to the Internet, Java is everywhere!
Groovy
Groovy builds upon the strengths of Java but has additional power features inspired by languages like Python, Ruby and Smalltalk. It makes modern programming features available to Java developers with almost-zero learning curve.
Python
Python is a general purpose programming language created by Guido Van Rossum. Python is most praised for its elegant syntax and readable code, if you are just beginning your programming career python suits you best.