The كتاب اسباب النزول للسيوطي (Lubb Al-Nuqul fi Asbab Al-Nuzul) app, developed by الدرر السنية والكلم الطيب, is a free Islamic education and reference book, available on Android. The app is an excellent resource for Muslims who want to learn more about the reasons behind the revelation of Quranic verses and chapters.

The app is based on the book Lubb Al-Nuqul fi Asbab Al-Nuzul, written by Jalal al-Din al-Suyuti, a renowned Islamic scholar. The book explains the reasons and contexts behind the revelation of each verse and chapter, and provides a deeper understanding of the Quranic text. The app also includes Tafsir Al-Quran by Al-Sa'ban and other important works by Al-Suyuti such as Al-Itqan fi Ulum al-Quran, Al-Tadrib fi Sharh Taqrib, and Al-Tibyan fi Tafsir al-Quran. The app is a must-have for those who want to gain a comprehensive understanding of the Quranic text.