Hack vs Kotlin: What are the differences?
Developers describe Hack as "A programming language for HHVM that interoperates seamlessly with PHP". Hack provides instantaneous type checking via a local server that watches the filesystem. It typically runs in less than 200 milliseconds, making it easy to integrate into your development workflow without introducing a noticeable delay. On the other hand, Kotlin is detailed as "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.
Hack and Kotlin can be categorized as "Languages" tools.
"Interoperates seamlessly with php" is the top reason why over 5 developers like Hack, while over 28 developers mention "Interoperable with Java" as the leading cause for choosing Kotlin.
Kotlin is an open source tool with 28.3K GitHub stars and 3.28K GitHub forks. Here's a link to Kotlin's open source repository on GitHub.
Slack, 9GAG, and Rainist are some of the popular companies that use Kotlin, whereas Hack is used by Facebook, Slack, and Wizters. Kotlin has a broader approval, being mentioned in 268 company stacks & 208 developers stacks; compared to Hack, which is listed in 8 company stacks and 3 developer stacks.