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I initially developed an iOS app (https://ayahbyayah.com) using Objective-C in 2012 (10 years on the AppStore next month)

Re-developed in Xamarin.iOS in 2016 which has been a solid decision due to the productivity gains I get from C# and Visual Studio tooling.

Xamarin.Forms works well for line of business apps and the performance with iOS was fine, however encountered a number of Android performance issues which is simply due to the nature of the framework.