Is there such a thing? My katakana is a horrid mess. The exposure WK gave me to hiragana made me read it quite fluently. I thought that the same process could be applied to katakana now. Surely someone else must have had a similar thought and have done it?
I use this:
It is also helpful to see what is ON and KUN with a quick look.
Almost perfect; since most is onyomi anyway it should certainly give me enough exposure.