Currently, Budget Flow does not support synchronization between Apple and Android devices. While Apple devices use Apple’s iCloud to synchronize data across iPhone, iPad, Mac, and Apple Watch, the Android version stores data locally on the device.
However, a new (optional) cross-platform synchronization service is planned for the near future, allowing users to sync their data and share budgets across Apple and Android devices.
For more information and updates, check out the Cross-Platform Sync feature request on the public roadmap.