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It's a simple, fast, and easy way to practice your hiragana or katakana quickly.
The first is more minimal and lets you choose which of the aiueo columns you want to review. Just type in the English equivalent and it automatically moves to the next prompt. It also allows most IME variants like ti or chi for ち.
You're not penalized for wrong answers — it simply won't switch to the next prompt. You'll need to realize it's wrong, backspace, and try again. It's a simple, fast, and easy way to practice your hiragana or katakana quickly.