Yes, すべての人に数学とスペルの一級挑戦 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.
すべての人に数学とスペルの一級挑戦 is free.
To get estimated revenue of すべての人に数学とスペルの一級挑戦 app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.