カタカナカード
assistbamboowing
Katakana Pro
Gerson Luca
Katakana Quiz
MLMG
カタカナゲーム
Kou The End
Katakana Memorizer
Hajime
Kana (Hiragana & Katakana)
Jerry Studio XYZ
Hiragana Katakana Quiz
Royalturtle
Hiragana / Katakana Test
MogaOne.com
Hiragana/Katakana Drills
Appicenter LLC
Katakana Memory Hint [English]
The Japan Foundation