IlmSarf is an Android application developed by TareenSoft, available for free in the Education & Reference category. It is a must-have book for people interested in learning the Arabic language. The book is considered the mother of the Arabic language, and it is often translated as "morphology." The app aims to teach the science of sarf, which is mostly relegated to verbs and that which derives from them. This change is done to stretch the meaning and to make pronunciation easy upon the tongue.

The book is designed to provide the principles of sarf that are sometimes the difference between imaan and kufr (belief and disbelief). The app provides a comprehensive understanding of the Arabic language, making it easier for people to learn and understand. IlmSarf also provides examples of how to change the meaning of a word through sarf, which helps users understand the concept better. Overall, the app is a great tool for anyone looking to learn the Arabic language.