Perfect English Courses is a free Android application developed by Educational Systems that enables you to learn English without an internet connection. The app offers over 100 lessons with audio examples and different ways to study English, including levels and exercises.

With Perfect English Courses, you can improve your daily conversation skills in English. The lessons cover a wide range of common topics, situations and skills, such as travel, work, school, business and social life. The app offers three levels: basic, intermediate and advanced. You can choose to select one or perform a small test to evaluate yourself.

In addition, Perfect English Courses offers two additional levels: business and travel to improve your daily conversation in English. Each level has many important lessons with exercises and corrections at the end of each lesson to evaluate yourself and see if you still need to practice more or move to the next level. The app also features listening tasks, clear and easy user interface navigation, and text to voice functionality to listen to text and vocabularies by clicking on the "read" symbol.

Overall, Perfect English Courses is an excellent app for anyone who wants to learn and improve their English skills. With its user-friendly interface and offline accessibility, it is a great tool to help you learn English at your own pace and convenience.