I would love to use this app! I have been doing something to similar effect for Anki except using web scraping/API of various japanese dictionary sites with python scripts. The whole thing is clunky and buggy and requires a fair amount of manual work (which i always intended to automate, but not had the time), so i would love to use an app that does this all well.

Unfortunately being iOS only locks me out. I noticed at the bottom of the page it states it was built from the ground up for iOS. This tells me it could take a while (maybe never) to get a port to another OS.