Hissab is a versatile calculator app that allows users to perform a wide range of calculations. It is designed to be intuitive and powerful, supporting basic math operations, percentage calculations, unit conversion, date and time calculations, and more. Hissab is available on various platforms including web, mobile, desktop, and browser extensions. It offers a free version with many useful features, and a Pro version with advanced capabilities such as currency exchange rates, autocomplete suggestions, and organization of calculations into books and pages. Hissab aims to provide a seamless and efficient calculation experience for users.