In Kotlin, you can use any Java library without a wrapper. That includes JavaFX of course. TornadoFX is only a convenience skin on top of JavaFX to make Kotlin

In Kotlin, you can use any Java library without a wrapper. That includes JavaFX of course. TornadoFX is only a convenience skin on top of JavaFX to make Kotlin code more concise (but it's heavier also as it adds a lot of code to your application).