We get asked a lot about whether you can sign in to Book Creator for Chrome and/or Book Creator for iPad and see all the books you've made on either device.
You can't do this, as the iPad app and web app are independent from each other. Book Creator for iPad is an offline app that doesn't require sign-in.
However, you can easily transfer books from the iPad to the web app or vice versa:
Or it might interest to you know that the web app works on iPads in Safari (iOS 11+).