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We at https://lekh.app wrote our own tiny UI library in C++ to implement our canvas screen UI. Here is a screenshot https://i.imgur.com/gr1ernJ.png of the canvas screen. Lekh is a whiteboarding and diagramming app.

With a single codebase, we are running on iOS, Android and web. We do not have our own Rasterizer but we depend on the platform for that. We render in the main UI thread and performance wise we are fine on these three platforms.

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What about text input? That's often where this kind of solution is lacking for more general-purpose use.

Does it support selection? Cut and paste? European languages? Chinese and Arabic? Hiding and showing the virtual keyboard as appropriate?

Text input is an exception. I mean, we used the platform text input instead of implementing our own. We have our own API for text input but under the hood it uses platform text input.

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