O Santo Terço is a free Android app developed by Renan Willamy. It falls under the Social & Communication category and provides a simple yet helpful way to pray the rosary. With this app, you can follow the rosary by viewing images of each mystery and tracking your progress. The interface is easy to use and visually appealing, making it a great tool for anyone who wants to pray the rosary.

The app is straightforward and easy to navigate. You can choose to pray the rosary in either Portuguese or English, and the app also includes the option to pray the Chaplet of Divine Mercy. The images of each mystery are beautifully rendered, and the app provides a helpful guide to the prayers associated with each bead. Overall, O Santo Terço is a great app for anyone looking to deepen their prayer life through the rosary.