MIT App Inventor is a user-friendly visual programming platform designed to facilitate building mobile phone and tablet applications (apps) through an interactive interface. It allows users to design the graphical user interface (GUI) and program functionalities for apps without extensive coding knowledge. In this concise paper, the authors investigate the development of an educational app (chatbot) using the MIT App Inventor platform, focusing on mathematics accessibility tailored for students with dyslexia and colour blindness. The personalised chatbot offers assistance and guidance in mathematics learning for primary education students. Integration of generative AI enriches the chatbot's capabilities, enabling dynamic interactions and customised learning experiences. The app incorporates features to accommodate diverse learners, specifically emphasising engagement and accessibility, aligning with the Universal Design for Learning (UDL) principles.