Better app quality
Kotlin allows developers to be more expressive and focus on shipping features instead of writing boilerplate, ultimately leading to less code to write and maintain. 67% of Android developers say Kotlin has increased their productivity.
When the Cash App team started using Kotlin, they were able to eliminate many builders, and cut down on the amount of code they needed to write. In some cases, they saved 25% of their code.
Kotlin was the #4 most loved programming language in 2020 according to Stack Overflow. This aligns with what we uncovered from surveying the Android developer community: Android developers report being happier with Kotlin, and satisfaction using Kotlin is 25 points higher than it is for other languages.
As an example, after adopting Kotlin, Duolingo’s internal developer satisfaction skyrocketed by 129 NPS points, and Kotlin was a major factor cited in responses.