Kotlin

Kotlin is now the definitive language for Android development, with 95% of the top 1,000 Android apps built on it. Kotlin Multiplatform Mobile (KMM) extends its reach to iOS, enabling shared business logic across platforms that reduces development time by up to 40%—a savings over #5 JavaScript’s typical multi-framework approach. This efficiency, combined with Google’s full endorsement, makes Kotlin a strategic choice for mobile-first teams.