Comparative Analysis of Kotlin, Kotlin Multiplatform, Swift, Flutter, and React Native in Cross-Platform App Development

This paper investigates and compares five prominent technologies in the modern app development ecosystem: Kotlin (and its multi-platform extension), Swift, Flutter, and React Native.The study examines their application in mobile, watch, and laptop (desktop) app development with respect to performance, speed, compatibility, learning curve, and current as well as future market demand.[1] [2] [3] [4] By analyzing both technical attributes and ecosystem trends, this research aims to provide developers and decision-makers with insights into which framework or language might best suit different project requirements.