How to use: This app is for when shops allegedly have special offers on certain products and certain quantities. This app will calculate the difference in cost per unit of two similar items with differing costs and quantities and tell you which product is the best value for money and by how much.

Example: 1 x 100g Milky Bar costs £1.25 while a multipack of 6 x 81g (486g total) Milky Bars cost £5.99, which is cheaper?