Built for Productivity: What the Data Finally Shows About Kotlin | The Kotlin Blog

Kotlin, designed with a focus on developer productivity and pragmatism, has shown tangible benefits in reducing development time compared to Java, according to a comprehensive study by JetBrains Research. This study analyzed development cycles of over 320,000 developers, revealing that Kotlin developers completed tasks 15%-20% faster than their Java counterparts, across small, medium, and large tasks. The language's design features such as data classes, null safety, and coroutines contribute to more readable and maintainable code, which becomes increasingly valuable as more development tasks shift toward reviewing and integrating AI-generated code. Over a 20-month period, Kotlin projects demonstrated minimal slowdown in development speed, unlike Java projects, which experienced a significant increase in cycle time as codebases grew. These findings suggest that Kotlin's advantages in readability and maintainability enhance not only immediate productivity but also long-term project efficiency, making it an appealing choice for modern software development, especially in environments where AI and agentic workflows are prevalent.