iRetirement for iPhone lets you see the future two ways. First, you can see how your 401k or IRA will grow so you will know how much will be there when you plan to retirement. It allows you to study various scenarios with just a few key strokes and secondly, maybe importantly it allows you to work backwards to know you much retirement investment you will need. That is, it will ask how much you expect your monthly budget will be in retirement, it will ask how much income you have from other sources such as social security and then it will work backwards to determine just how much 401k you will need to begin retirement. It will tell them where they are and can and how they can arrive at retirement. You can hardly pass up this opportunity. It is the tool that many have been waiting for to assess their financial reality.