Best way to invest your pocket change using money box

The best way to make money and save is using this app called money box which invests your pocket change which invests your money automatically and after 11 days gives your interest of money basically how this app works is for example let's say I go to a shop and spend £2.45 on a coffee using my debt card this app will record your purchase and will automatically round up to the nearest pound and invests your money for this instance it would be 55p because I spend £2.45 on a coffee after 11 days will give you intrest of your money invested this a good way to start long term saving with little as £1 this app is very reliable and you can cash out at any time when ever you want