Uglier is relative, but I will give you that neither unthemed Swing or JavaFX are too fine looking. But I would say that e.g. IntelliJ looks quite good and tha

Uglier is relative, but I will give you that neither unthemed Swing or JavaFX are too fine looking. But I would say that e.g. IntelliJ looks quite good and that is a basic theme available without much tweaking, plus it can be very snappy (when jetbrains doesn’t ship it with a decade old JVM with shitty default settings. It is fixed in recent versions).