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What is the lowest iOS version that is supported by Kotlin/iOS?

If you’re using SKIE (which I can only recommend), the oldest supported version is iOS 13 because SKIE needs support for Swift Concurrency. This means that all iPhones and iPads released since 2015 are still supported (<https://iosref.com/ios|they all can run at least iOS 15>).

Currently iOS 12: <https://github.com/JetBrains/kotlin/blob/master/kotlin-native/konan/konan.properties#L96>