Fácil Estacionar - Zona Azul is an Android application that allows users to purchase parking tickets in cities that use the Fácil Estacionar system, including São Caetano do Sul, Diadema, and Itapevi. The app also offers a simple registration process, credit purchases using Visa and Mastercard, and the ability to check your balance and transaction history.

One of the most useful features of Fácil Estacionar - Zona Azul is the ability to easily keep track of your parking time. The app displays the remaining time until your parking ticket expires, and you can even set an alert to remind you when your ticket is about to expire.

Overall, Fácil Estacionar - Zona Azul is a convenient and practical tool for anyone who frequently parks in the Fácil Estacionar system cities. It's easy to use, and the ability to purchase credits and monitor your parking time makes it a must-have for anyone looking to simplify their parking experience.