I don’t how difficult this would be to implement, but for my learning I really like to differenciate between similar items by looking at them side by side. When is comes to the SRS and the way that WaniKani unveils things, I often unlock similar looking items far apart from each other. Then, given how often I do my reviews these items may never be in the same review pile. Meaning I won’t usually see these items near each other, and without being able to compare and contrast them I may not really pick up of the subtle differences. This can lead to confusion of these items, and continuation of leeches. Being able to see them side by side helps to solidify them in my mind, so I’m less likely to confuse them with another similar item when they come up. I would really like a place where I can bring up similar items and look at them next to each other in a clean, large and easy to read format kind in like a compare/contrast/spot-the-differece diagram or table. [If that makes any sense haha… I’ll be happy to answer any questions people may have with my request too.] I would like them to have the symbol for the item large on top with a succinct version of the info below it with the whole thing in a box color coded to the type of item it is (radical, kanji, or vocab). To compare, another item in the same formant would pop up horizontally adjacent to it. Ideally, I would like to be able to manually add and take away items to compare on that format, as well as load my API key into the system to autogenetate a diagram of similar items I’ve unlocked.
Another semi-similar request I have would be to have a drag and drop version of WaniKani items. When I was learning my kana I really benefited from the drag and drop programs of each for the same reasons. I was able to see all the kana in one place and compare and contrast the difference with them all spread out near each other instead of reviewing them one by one alone and never really seeing these differences. I feel like this tool was instrumental in giving me a very good recognition of the kana and I’m hoping a similar thing can be done with wanikani on a much larger scale.