Would it be possible to add writing to WaniKani? One of the best ways to memorize things is to write them down, so adding writing as a feature to WaniKani would probably be invaluable.
Could either be merged in the existing service or added as an extension with separate levels. But basically when a kanji is introduced you also see the stroke order and you would be quizzed on that periodically as well. Could be implemented either has free writing or to just have the user select the correct order of each stroke as it fills in automatically.
Just a clarification, Ringotan is not connected to Wanikani, but it does support the Wanikani kanji ordering so you can use them side-by-side. I would like to add Wanikani API support eventually, though.