Calculo de Regra de Três is a free Android application developed by Rodrigo Aramburu, aimed at assisting users in solving simple and inversely proportional three-rule problems. The app has a simple and clean design and provides detailed calculation steps for the problem.

The app's main feature is its ability to solve simple and inversely proportional three-rule problems, making it an ideal tool for students and professionals alike. The app's intuitive interface and straightforward design make it easy to use, even for those who are not familiar with the subject matter.

Calculo de Regra de Três is a useful app for anyone who needs to solve simple and inversely proportional three-rule problems and wants an easy-to-use tool with detailed calculation steps. However, it lacks any additional features or functionalities beyond its primary purpose.