The app is designed as a compensatory-speech tool for the inclusion of sudents with Special Educational Needs and Disabilities (SEND). Thanks to the clarity of speech, ease of use and size of the keys this application is ideal for anyone who has difficulty in recognizing numbers or figures. The calculator includes: - The four fundamental operations (sum, product, multiplication and division); - Additional functions such as square root, percentage, exponentiation and so on; - The mute function t