Yes, 莱特葡萄牙语阅读听力 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.
莱特葡萄牙语阅读听力 is free.
To get estimated revenue of 莱特葡萄牙语阅读听力 app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.