mockk vs Mockito: What are the differences?

What is mockk? Mocking library for Kotlin. It is an open-source library focused on making mocking in Kotlin great. It is a library with the possibility of mocking default arguments, final classes, varargs, coroutines and extension methods.

What is Mockito? Tasty mocking framework for unit tests in Java. It is a mocking framework that tastes really good. It lets you write beautiful tests with a clean & simple API. It doesn’t give you hangover because the tests are very readable and they produce clean verification errors.

mockk and Mockito can be categorized as "Testing Frameworks" tools.

Mockito is an open source tool with 10.2K GitHub stars and 1.81K GitHub forks. Here's a link to Mockito's open source repository on GitHub.