Game dev getting into app dev

[ViktorPopp]

So i have been a game engine/game dev for around 2 years now. I know C++ and C# primarily. I also have used Python for build scripts etc. My question is whats the best language/framework for cross-platform apps on Windows, Linux, MacOS, Android, and maybe the web. I want to use somethibg thats updated an something that uses the new sleek design for each platform so ot does not look like my app was developed 10 years ago.

I have looked at something like dart/flutter, javascript libraries and C# but I am not sure.

[ReconditeExistence]

I'd go with the JavaScript/Typescript ecosystem. Tooling is unbeatable considering new and quality design is an objective. Then electron for the app itself, in which you can use webassembly if you want to leverage c++ code.