Change the app bundle identifier to differentiate between schemes. 
In Product Bundle Identifier, append .free to each -free scheme value.

In the Build Settings, set the Product Name value to match each flavor. 
For example, add Debug Free.

Add the display name to Info.plist. Update the Bundle Display Name 
value to $(PRODUCT_NAME).

Now you have set up your flavor by making a free scheme 
in Xcode and setting the build configurations for that scheme.

For more information, skip to the Launching your app flavors 
section at the end of this document.

Plugin configurations

If your app uses a Flutter plugin, you need to update the ios/Podfile.

In ios/Podfile change the default for Debug, Profile, and Release 
to match the Xcode build configurations for the free scheme.

project

'Runner'

'Debug-free'

=>