Yes, 睡眠-失眠人士好帮手,白噪音&冥想&助眠 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.
睡眠-失眠人士好帮手,白噪音&冥想&助眠 is free.
To get estimated revenue of 睡眠-失眠人士好帮手,白噪音&冥想&助眠 app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.