RIOCARD DUO is a free Android app developed by Caruana Financeira that provides a hassle-free and convenient way of accessing various public transport options, making purchases, paying bills, and managing expenses in Rio de Janeiro. The app offers a range of features, such as the ability to recharge your prepaid mobile phone and control your spending without the need for a bank account or credit check.

With RIOCARD DUO, users can access all the public transportation options available in Rio de Janeiro, make purchases at thousands of commercial establishments, and pay bills such as electricity, water, and phone bills, as well as other bank slips. The app also allows users to activate their RIOCARD DUO and manage their account, all from the comfort of their own home.