Learn how to calculate your ROI: Use App Events to get detailed insights how ads are adding value to your business.
Work with a Facebook Marketing Partner to get deeper insights or measure across several ad networks. Search for a Measurement Partner.
The Ads Manager is your off-the-shelf tool to get insights about the performance, audience and placement of your ads.
Facebook Analytics helps you to understand how people interact with your app and which of these actions originate from your ads.