Tensai

Tensai is a Japanese language dictionary and study aid for native English speakers, designed for maximum readability and efficiency to make studying less stressful and more fun.
Using Tensai you can look up the kanji, readings, and meanings for words, phrases, and individual characters in both Japanese and English, and you can do so quickly and efficiently.

You can also make persistent vocabulary lists in Tensai, keeping the entries you’re interested in handy for future study and reference.