Text Book - Biology Class IX (PTB) is a free, comprehensive textbook app for Biology Class 9 students following Punjab Text Book Board's curriculum in Pakistan. Developed by Open Educational Forum (OEF), this app aims to provide free educational support resources to students. It is an offline app that requires only a one-time download. The app covers all main topics with easy navigation among pages and solution contents of maths book. It has several features to improve student engagement, such as zoom in/out, underlining, marking, and highlighting content, saving, and sharing edited pages. In addition, the app offers printing, scanning, saving, editing, and highlighting important lines for future reference. The app is easy to use, with a simple and intuitive design, and is available in English and Urdu language mediums. Users' feedback will be highly appreciated in improving this and related apps.