Yes, 数学1の王様‐高校数学を勉強する問題集アプリ is completely free and it doesn't have any in-app purchases or subscriptions.
Not enough reviews to make a reliable assessment. The app needs more user feedback.
数学1の王様‐高校数学を勉強する問題集アプリ is free.
To get estimated revenue of 数学1の王様‐高校数学を勉強する問題集アプリ app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.