The best alternatives to Kanji Words are Duolingo, Simply Learn Japanese, and Mainichi. If these 3 options don't work for you, we've listed a few more alternatives below.
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Starting from the origins, we will take you through the origins of Japanese kana and its relationship with kanji, helping you to better understand and distinguish these kana.
I created Kana Trainer because I couldn't find an easy and not bloated app to learn Japanese Kanas. I mixed Machine Learning with some algorithm and a simple interface. If you're new to Japanese language, this app will be of great help.