This website tells you what private information apps might be tracking
The tool can be found at InAppBrowser.com. All you need to do is open the app you want to check and share the InAppBrowser.com URL somewhere within it — such as DMing the link to a friend or posting it in a comment. From there, you can tap the link and get a report from the website on what scripts are running in the background.
Source: This website tells you what private information apps might be tracking – The Verge