You can use any of the two, the mobile app or web version interchangeably thanks to the simple login system.
Just download our mobile app from the Play Store (Android) or the App Store (iOS). In the subscription page you will find a login link, where you will be able to enter your user id and password.
You will find them in the web version, in page Your account, at the bottom of the page.
Once you login, you will be able to use the app just as the web version. The look&feel and features are the same.