OTP Conductor is a suite of applications for iOS, watchOS and macOS that provide 2-factor authentication support. It runs across all your Apple devices and synchronize data via iCloud and iCloud Keychain.
Once you add an account, it will be available on all iPhone, Mac and Apple Watch signed in with the same iCloud account.
iOS App also supports QR code scan.
OTP Conductor is fully compatible with Google Authenticator and provides a more native approach for the Apple ecosystem.