For the beginning, I know there are questions like this already, but they are all outdated and all apps that people recommended doesn't exist or don't work. So, is there any new app like tideSDK or something that can just simply export html code to (if possible cross platform) app. Windows or Mac? I know there is AppJs but it is a little complicated to use and it isn't clean. Also I think nw isn't good enough too. So does anyone know any good program that can do that? If possible with GUI.
You could give Electron a try. Applications like Visual Studio Code, Atom, and Slack have been built with it, and (in my experience) those apps are quite impressive and stable.
The link I provided has a list of software built with Electron, as well as a getting started guide further down the page.