[cellaris]

I’ve had a quick go and the reading apps work independently. You can turn pages and look things up in the dictionary in each one. What I’m not sure about is whether you can have the dictionary open in both at the same time.

Edit: Depending on the app and dictionary you use, you can have them open in both places at the same time. For example, you can have the Kindle app open with its own dictionary and AlReaderX open with the Onyx dictionary at the same time.

There are some e-reader apps that aren’t compatible with split-screen mode. KOReader is one of them (at least for me). But most work: Kindle, PocketBook, Readest, Moon Reader, Librera, Alreader X...