I have used Tsurukame for a while, but I was annoyed that I couldn’t add notes, edit meanings (and see my edits), etc.
Luckily, this app came along! I downloaded in Jan 2021 and I love it. It looks and feels a lot like the WaniKani website, which is nice. It has clear UI for adding notes to mnemonics and synonyms. It also has an easy navigation to drill backwards from a vocab word to the kanji and then it’s radicals. Lastly, if you get a meaning wrong and want to review it, it shows you the meaning, but not the pronunciation (unless you click over to that), and vice-versa.
The app is new, and there are a few improvements I’d like to see:
1. I sometimes have an issue when I add mnemonic notes. My keyboard slides up from the bottom but hides the note-taking area and the save button. So I have to type RETURN over and over until those buttons come into view.
2. It would be nice for the buttons, currently at the bottom, to be moved up higher. This includes the buttons for next card, review card, and re-do card. The “next” button is in the very far bottom right corner, and it’s kind of hard to hit. It hurts my hand.
These are both minor issues and don’t really impede my use, but it would be nice to see them improved in future versions. Great app so far!