The “Book of Tawhid” application by Sheikh Muhammad bin Abdul Wahhab bin Suleiman Al-Tamimi provides an essential reference for everyone who wishes to understand the correct Islamic doctrine, as this book is considered one of the greatest books that dealt with the monotheism of God and the rejection of polytheism in a clear manner and supported by evidence from the Qur’an and Sunnah. The application provides an easy and smooth reading experience through a modern and integrated user interface. The application includes important features such as a table of contents that facilitates quick access to different chapters and sections, and a bookmark feature that allows the user to save important pages to return to later. The application also supports the ability to enlarge and reduce text to suit different user needs, in addition to day and night reading mode to maintain eye comfort while reading. This application is an ideal tool for anyone seeking to enhance their knowledge of God's monotheism in an organized and effective way.