Mahmoud Bin Ali Basa's Al-Ameed in the Science of Tajweed is a free Android application developed by Bahja.Net. The app is an educational and reference tool that provides a comprehensive guide to the science of Tajweed. The book was written by Mahmoud Bin Ali Basa Al-Masry, who passed away in 1367 AH. The book contains 27 lessons that cover topics such as the general introduction to the science of Tajweed, the specific introductions to the science of Tajweed, and the rules and types of Nun Sakinah, Tanween, and the differences between them. It also covers topics such as the appearance of Halki, Idgham with Ghunnah, Idgham without Ghunnah, Iqlab, and Ikhfa. The book is a valuable resource for anyone who wants to learn and master the art of Tajweed.