It is possible to sync data between Apple devices sharing the same iCloud at no additional cost. For the iCloud Sync to work, your devices have to use the same iCloud.
Money Pro Sync is a cloud service that allows you to sync your data across different platforms (iPhone, iPad, Android, Mac, Windows) and also track expenses with other users. Money Pro Sync enables you to manage family expenses and serves a great tool for a small business finance management. One user can sync up to 5 devices of different platforms and join up to 10 users for sharing the same profile. The service is provided for a small monthly fee and is available with PLUS or GOLD subscriptions.