iOS: Budgeting isn't always the prettiest or easiest-to-understand endeavour. Funds aims to change that by making the process of allotting your money as simple as possible.
Funds allow you to set your income, then deduct from that your expenses and savings. It will return some easy-to-read pie charts that show what proportion of your income is going to which activity. This can be particularly helpful when creating a zero-sum budget.