Are my Stacks synced across devices?

Yes, Stacks are synced to iPad, iPhone, and Web by individual FatStax users. If you create a Stack on the iPhone, you will see it if you login to the Web or your iPad. If you sent a Stack from the web, you will see that Stack in the Sent Category on your iPhone and iPad. While you can create and send Stack while in an offline mode on your iOS devices, the devices will need to be online to sync the information with your other devices.