Flashwords app only collects anonymous crash reports and anonymous app usage analytics on devices.
These reports are totally anonymous and are not shared with other parties.
When subscribed, the app confirms subscription period and payment info on iTunes (or Play Store on Android devices). 24 hours before every payment period, a new payment will be requested and if it is successful, subscription will be renewed. You can cancel your subscription anytime from iTunes (or Play Store on Android devices).
When subscribed, the app can be used without ads, and new features that will be added in the future are guaranteed to be available.