| Swift (native iOS) | Kotlin (native Android) | |
|---|---|---|
| Maintainer | Apple | JetBrains (Google-endorsed for Android) |
| First release | 2014 | 2011 |
| License | Apache 2.0 | Apache 2.0 |
| Learning curve | Moderate, the language is friendly and SwiftUI simplified UI work dramatically, but mastering Apple's frameworks takes time. | Easy coming from Java and pleasant from scratch; coroutines and Jetpack Compose idioms take a little longer to master. |
| Performance | The ceiling on iOS, compiled code with direct access to every Apple API, Metal graphics and the latest hardware features. | Full native Android performance with direct access to every platform API; also a strong JVM backend language (Ktor, Spring). |
This is rarely an either-or, swift owns iOS and Kotlin owns Android, and fully native products need both. The real decision is whether to run two native codebases (maximum quality, double cost) or share code with Kotlin Multiplatform, Flutter or React Native. Both languages are modern, safe and a pleasure to work with.
Swift (native iOS) · Kotlin (native Android) · All technology comparisons