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.
What do you think of Kanji Words?
AssemblyAI— Speech-to-Text API with superhuman accuracy
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.