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If it works in a browser, you can run it in a Webkit wrapper.

Or in Electron. Ok, not the coolest solution but options are always good.

Standard caveats apply (i.e. WebRTC is unsupported outside safari)

At least on Android, Termux is pretty great: https://termux.com/

I think you can additionally use it with React Native. I saw a cross-platform android/ios GitHub client using it.¹

[1] https://twitter.com/GitShark/status/1273043228355252224

You can include JS in iOS apps. You basically embed Javascript and call it directly from Swift/ ObjectiveC and it runs on the same Javascript engine that runs in Safari.

Can you run Node on iOS or Android?

I don't think you need to. Node is essentially a way to run Javascript from the command line. iOS provides a different way to run javascript. I think you just build the app similar to the way you bundle something for the web.

Why couldn’t you host a web app on a phone?