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None, abstract the functionality of your app into a cross-platform library and build a native GUI for each platform you support using that platform's native SDK.

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To expand on that, BackBlaze did a blog post on cross-platform tips: https://www.backblaze.com/blog/10-rules-for-how-to-write-cro...

Shouldn't this be a solved problem?

There's a reason there are multiple OS's, right?

One of the reasons is different UI paradigms and choices.

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