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If you're going to rework it, perhaps consider making it a web app? Wrap it in Electron for desktop use, I bet there's something similar for iOS / Android.

That'd make it available as both a dedicated app for power users, and an (ad-supported) variant for occasional use.

Moving to Avalonia from WPF should be relatively straightforward (except, possibly, the WPF 3D part), and Avalonia is capable of targeting mobile platforms (even though it really is desktop-first, when compared to Uno or MAUI). As a bonus it will run on macOS and Linux too.

Even if mobile v1 was simple level by level text output, it'd probably still be useful.

Probably yes. Implementing only the text output should be very simple. Anyways, I'll look into it.