Furumototoku
すごく素晴らしいアプリだと思いますが、「train」を押すと、漢字の説明書はほんまに微かです。
ジョンソンユージーン
You're supposed to be able to limit the kanji to certain levels, like N5 or grade 1, but it shows kanji from all levels regardless of the level you've chosen. Otherwise, I think it's good, and generally works well for the most part.
Yuşa Çetin
Fantastic, just 2 suggestions: please make a list of randomly displayed kanji so that the same kanji doesn't show up before a certain number of other kanji (e.g. 100) have been shown; and please update the icon as adaptive, it looks really outdated