Tohands: The World's First Smart Calculator App and Shop Management App to Track Sales, Expenses and Inventory Manage Your Dukaan and Improve Your Dhandha with Tohands Tohands is your all in one app designed to make managing your shop’s hisab kitab easy. Tohands app offers syncing with its smart calculator device, enabling you to manage your shop finances (len den), create item wise bills, track inventory, maintain detailed customer/vendor ledgers, manage udhar bahi khata —all in one place.