Apps like Katakana Memorizer

Here are some great alternatives to Katakana Memorizer by Hajime :
Learn Hiragana Katakana
Learn Hiragana Katakana
★4.3
Kana (Hiragana & Katakana)
Kana (Hiragana & Katakana)
★4.0
Kana Quiz Japanese
Kana Quiz Japanese
★4.5
Kana Draw (Hiragana Katakana)
Kana Draw (Hiragana Katakana)
★4.5
Writing Order Hiragana
Writing Order Hiragana
★3.9
Japanese Alphabet- Character
Japanese Alphabet- Character
★4.7
Write It! Japanese
Write It! Japanese
★4.7
Transwhiz Happy Learn Japanese
Transwhiz Happy Learn Japanese
★4.7
Simple Kana
Simple Kana
★4.6
Japanese Letter -Learn Hiragan
Japanese Letter -Learn Hiragan
★4.6
Kana Heroes: Hiragana & Kataka
Kana Heroes: Hiragana & Kataka
★5.0
Kanji Dojo: Efficient Japanese
Kanji Dojo: Efficient Japanese
★4.6
Japanese Writer
Japanese Writer
★3.5
Japanese characters (PLUS)
Japanese characters (PLUS)
★4.7
Katakana - Read and Write
Katakana - Read and Write
★4.3
Japanese Katakana Handwriting
Japanese Katakana Handwriting
★4.2