Es wird beides lt. eigenen Angaben genutzt, bzw. eigentlich sogar drei: Amplitude, Facebook-SDK und -Analytics
Facebook SDK und Facebook Analytics sind m.W. schon zwei verschiedene Dinge.
https://readdle.com/privacy
»2.1.2 Regarding the App: certain data is transmitted by your mobile device: namely your IP address, the periods of time in which you use the App and the type of device you use (e.g. IPhone, IPad), as well as events within the application recorded with Amplitude analytics in order to give us the possibility to continuously improve the App.«
»3.4 Our Apps use Facebook SDK of Facebook 1 Hacker Way, Menlo Park (, ) to analyze sources of app installations and how you use the app. Facebook SDK and Analytics is a service which helps us to improve ours Service by better understanding general app usage patterns.«
https://readdle.com/privacy
»2.1.2 Regarding the App: certain data is transmitted by your mobile device: namely your IP address, the periods of time in which you use the App and the type of device you use (e.g. IPhone, IPad), as well as events within the application recorded with Amplitude analytics in order to give us the possibility to continuously improve the App.«
»3.4 Our Apps use Facebook SDK of Facebook 1 Hacker Way, Menlo Park (, ) to analyze sources of app installations and how you use the app. Facebook SDK and Analytics is a service which helps us to improve ours Service by better understanding general app usage patterns.«