How does the katakana quiz work?
Pick a set, a direction and a way to answer, then press Start. The quiz asks every katakana in the set once, in random order. Kana to sound shows a katakana and asks how it is read, Sound to kana gives the sound and asks for the katakana, and Both alternates between the two.
You can tap one of four answers or type the sound in rōmaji. The wrong answers come from the sets you picked, so a quiz on the basics never offers ジャ as a choice. A typed answer checks itself as soon as it is a whole sound, and only n waits for Enter. Both Hepburn and Kunrei spellings count, so tsu and tu are both right for ツ. Sound to kana questions are answered by tapping, because a Japanese keyboard would spell the katakana for you.
When you miss, the quiz shows the right sound and a hint to remember it by, and the katakana comes back before the end of the run. Only your first answer counts toward the score.
What does the result show?
The result lays the set out in chart order with every katakana you missed marked, then lists the pairs you mixed up most, up to three, such as ソ and ン. Under them, a line says how many of the katakana you answered come back later today, tomorrow, or further out.
When does a missed katakana come back?
Every katakana sits in one of six review boxes. A right answer moves it up one box and a miss moves it down two, and the boxes wait 10 minutes, a day, 3 days, a week, 3 weeks and 2 months before the kana is due again. A kana climbs at most one box a day, except out of the first, and from the fourth box the course counts it as mastered. The hiragana quiz explains the ladder and why it is capped.
Your answers stay in this browser, with no account. Yomikana, Yomimaru's free kana course, reads the same record, so its reviews include whatever you missed here.