الفقه على المذاهب الأربعة is an Android application developed by marqoom.org. It is a free educational and reference program that deals with the doctrine of the four schools: Shafi'i, Hanafi, Hanbali, and Maliki. The book is written by Sheikh Abdul Rahman Al Jaziri and is considered the most important contemporary reference on the subject.

The application provides a comprehensive understanding of the doctrine of the four schools of thought. It is an excellent resource for students and scholars of Islamic law who want to learn about the differences and similarities between the schools of thought. The book is well-organized and easy to navigate, making it an ideal reference tool for anyone interested in Islamic jurisprudence.