Mobile app developers often face the situation when native technologies are incompatible with each other on almost all levels. These levels can inc...
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How old is this article? Xamarin has been free for a few years now and Xamarin Studio has been replaced by Visual Studio for Mac.
React native is learn once write anywhere. You need to write separate ui's for Android and iOS.
Definitely not overall market's "top 4". Certainly your top four.
You are missing industry verticals leaders like Qt and Java.
No Capacitor?
I'm excited to see what happens with Kotlin entering the multiplatform space. I'm already loving Kotlin with PhoneGap, but excited to use it natively.