RMRShop is based on the best-selling Shopping List Manager (SLM) a PC Windows based program written by Joel Rose. The idea is that you predefine the location (aisle) of the items you normally buy in each of your local stores. Then, when it is time to go shopping you can build your shopping list simply by tapping on the items. Once complete, you can sort the list by aisle number, so that as you walk around the store the items are presented in order. They can them be crossed off as they are put into the shopping trolley. If the cost option is enabled, then each item can be allocated an estimated cost so you can see how much your shopping bill is going to cost. The program also copes with coupons, flagging such items in the shopping list.