How to write a cross-platform GUI application?

Question

Java

Good afternoon.
The task is to write a gui application for working with postgresql. Should work on win, linux, mac. I will do separately the main logic, separately gui. They will interact either through IPC, or in the gui application, the logic will be connected as a third-party library (I don’t know yet).
Actually the question is on what to write it?
The first thing that comes to mind is Qt. But I had no experience with crosses at all (and I'm not eager to start). I worked a little with java and more in C#. Ideally, I would like to write in C #, but, as far as I understand, everything is very bad with the GUI on non-win platforms. I don't know about java. Any options with javascript for the GUI are not suitable due to their slowness and non-native type of controls.
Tell me, is there an option to write in something other than Qt without pain?

Answer 1

Yes, C++ is an order of magnitude more complex than Java and C#, although Qt simplifies a lot.
Java is good for cross-platform office applications, - a GUI based on JavaFX or Swing, but not SWT (it has a lot of jambs that take a lot of time). If you know C# better, then on it (the language is more modern, the framework will be simpler) and immediately in MonoDevelop (since cross-platform is needed).
With the server part (if it is a three-link), it is important to decide on what it should work on (in which OS). If it’s also cross-platform, then it’s better to do everything in java and deal with Java server technologies: Spring or a Servlet container or even a Java EE server. Use an ORM (Hibernate for example). But this Java stack will have to be tinkered with - the entry threshold is high, but then rich opportunities open up (independent of the OS!).

Answer 2

Write in python. A graphical interface on Qt or GTK - depending on what widgets are needed.

Answer 3

Lazarus

Answer 4

Kotlin JVM works wherever there is java, Tornado FX is used for the GUI --- a wrapper for Java FX, as a bonus, you can quickly deploy the web version using Koltin JS.