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Being a professional developer I can say that Kotlin is the best programming language to develop an app like TikTok for Android OS. The overall performance of the app can even be improved if Kotlin is used by integrating it with Java.
Kotlin has also launched a cross-platform app development service that can be used to develop an app like TikTok for Android as well as iOS. I’m not entirely sure about its effectiveness for TikTok app development. So it is better to use Swift for iOS App Development.
Hope the answer gets you a clear understanding of the Kotlin Programming language for TikTok like App Development.