Can Flutter run without Xcode?

Without xcode you will not be able to build a flutter app that runs on an iOS simulator or device as xcode is what builds for the iOS platform. You will be able to run it on an android emulator that you configure and launch from within Android Studio, and that will work regardless of if xcode is installed .

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Can you Build for iOS without a Mac?

It is possible to develop iOS (and Android at the same time) application using React Native + Expo without owning a mac. You will also be able to run your iOS application within iOS Expo app while developing it. (You can even publish it for other people to access, but it will only run within Expo app).

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