Are the backups and exports compatible between iOS and Android? I.e. can I take the iOS export and put on my Android and have it import? 2 use cases to argue to make them compatible: changing device ecosystems if one got a new phone or tablet, and maybe even reading off 2 devices: android phone + iPad, read on phone in the morning, auto backup to Dropbox or other cloud-enhanced local storage, pick up iPad at night, resume reading (import if needed?) from where you left off in the morning.

I was automatically given the option to download the app to both my phone & tablet, which was a nice surprise. However, the app doesn't appear to sync the two together, so you can stay up to date as you progress through your schedule.