Apps like Katakana Pro

Here are some great alternatives to Katakana Pro by Gerson Luca :
Katakana Dictionary
Katakana Dictionary
★4.8
Fun! Katakana
Fun! Katakana
★4.0
Hiragana and Katakana
Hiragana and Katakana
★4.7
Katakana Memory Hint [English]
Katakana Memory Hint [English]
★4.5
2 Hour Katakana
2 Hour Katakana
★4.6
Katakana - Read and Write
Katakana - Read and Write
★4.3
Japanese Katakana Handwriting
Japanese Katakana Handwriting
★4.2
Japanese characters (PLUS)
Japanese characters (PLUS)
★4.7
Learn Hiragana Katakana
Learn Hiragana Katakana
★4.3
Obenkyo
Obenkyo
★4.6
QL Japanese Hiragana/Katakana
QL Japanese Hiragana/Katakana
★4.3
Japanese Kana-Dojo
Japanese Kana-Dojo
★4.6
Katakana Memorizer
Katakana Memorizer
★4.5
Japanese characters
Japanese characters
★4.4
Kana Draw (Hiragana Katakana)
Kana Draw (Hiragana Katakana)
★4.5
Hiragana/Katakana Drills
Hiragana/Katakana Drills
★3.5