Still reads and writes meditation session data to HealthKit on your iPhone. Meditation sessions are saved as MindAndBody workouts; this is a special type of workout that Apple has created for activities like meditation and Tai Chi. None of your HealthKit data is shared with anyone for any reason, nor is it saved or used outside of your use of the application.
Automatically Collected Information
Still uses a third party (Crashlytics and Answers, by Twitter) to 1) monitor application crashes for the purpose of improving the application and 2) collect analytics data including the kind of device you're using and the version of iOS you're running. This is done in order to make decisions about future application features and to provide feedback to the developer about the total audience for the application. All crash and analytics data is automatically aggregated and anonymized and is not shared with any other parties.
Data is not retained beyond your use of the application except as required to maintain the application state between uses. You can uninstall the application in order to remove any data you've provided or to stop the collection of anonymized crash and analytics data.