What is HyperJar? It’s a smart way to organise your money and earn a 4.8% annual growth rate (HyperJar's version of "interest") when you spend with their retail partners, like us! HyperJar encourages mindful spending by allowing you to actively save money towards a pair of Charlotte Dunn Design pyjamas. Think of an app that has multiple piggy banks and you just pop money into each piggy to save up towards groceries, restaurants, flowers and now pyjamas.