Privacy Policy ЕГЭ Обществознание: Полиграф For the purpose of saving your results and progress and synchronizing it across all your devices our app requires user to sign in with Google account. We use only account's id number and no other account information. We do everything necessary to store and transfer this data securely. For the purpose of showing advertisement we use Yandex Ads service. It uses your Android Advertising ID internally to show you the most interesting and relevant ads. We don't send this ID and other ad related information to our server. For the purpose of analytics and improving application quality app sends anonymous data about its usage and errors to the Google's service Firebase. If you have any questions about app's privacy, please contact us at support@polygraph.tk