Yes, 睡眠・瞑想・マインドフルネス is free to download, however it contains in-app purchases or subscription offerings.
Not enough reviews to make a reliable assessment. The app needs more user feedback.
睡眠・瞑想・マインドフルネス has several in-app purchases/subscriptions, the average in-app price is ¥207.96.
To get estimated revenue of 睡眠・瞑想・マインドフルネス app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.