Yes, 購入履歴管理アプリ 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.
購入履歴管理アプリ is free.
To get estimated revenue of 購入履歴管理アプリ app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.