Overall, Saldo Bip! is a simple and useful app for anyone who uses Bip or TNE cards. The interface is easy to navigate, and the app provides accurate information about your card balance. The only downside is that the app does not offer any additional features besides checking your balance. If you're looking for a straightforward app that does exactly what it promises, Saldo Bip! is a great choice.

Please note that the developer encourages users to leave feedback and rate the app with 5 stars to help improve it. However, the app does not require any personal information or contact with the developer.