Hajj-হজজ is an Android application developed by Markaz that serves as a comprehensive guide to Hajj, one of the five pillars of Islam. Hajj is a physical, financial, and mental act of worship that millions of Bengali-speaking Muslims participate in every year. This app has been created to assist and educate pilgrims on the rules and regulations, rituals, and procedures of Hajj.

The app features a step-by-step guide to Hajj, including a detailed explanation of each stage of the pilgrimage. It also includes an overview of the history and significance of Hajj, along with a glossary of relevant terms. The app is free to download and offers a wealth of information that is vital for pilgrims to have a successful and meaningful Hajj experience.