Synchronization between Devices and Shared Accounting
In Money Flow, you can set up full data synchronization between different devices. Synchronization is not tied to an Apple ID, so it can work with both your own devices and the devices of your friends and relatives.
To enable synchronization, you need to create a new profile: Settings ▸ Enable Synchronization ▸ Create new Profile, register as usual: enter your email, come up with a password.
To connect any other device to synchronization, log in on it using the created profile: Settings ▸ Enable Synchronization ▸ Sign-In.