Cliente Oculto OPUS is a free Android app developed by OPUS Consultoria e Pesquisa that enables users to find opportunities to perform audits and evaluations as a mystery shopper in their city. With this app, you can access training materials and contact the OPUS team for support during evaluations, all on your mobile phone.

Apart from this, you can invite your friends to join this experience as well. The app's interface is user-friendly and easy to navigate. Once you sign up, you can browse through the available opportunities and apply for the ones that interest you.

Overall, Cliente Oculto OPUS is a great app for people who want to earn some extra cash by performing mystery shopping tasks. With its easy-to-use interface and comprehensive support, it is a must-try for anyone looking to get started in this field.