Absolutely terrific!
This is hands down the best Japanese dictionary app out of all the ones I checked out for iOS. It does everything I would want out of an electronic dictionary. Look up words in English or Japanese by entering characters, or selecting radicals, or drawing the kanji. It automatically saves everything you look up to the history so you can refer to it later. You can also bookmark useful entries and organize them into folders. Each entry is very detailed: gives the definition, shows stroke order, gives example sentences, shows the relevant kanjis meaning, and lets you add notes. All words are cross-linked so you can easily jump to another entry. What a wonderful job this developer has done! Worth every penny!
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Midori (Japanese Dictionary)