MaxiFi is a long-range planning tool that helps you to build life-cycle models (i.e., models that reflect various periods of saving and dissaving; children in the house, children left home; working, retirement, etc.). It is not primarily an asset allocation tool or an investment analyzer that shows historical yield, standard deviation, or any other kind of data you might explore about funds or asset classes. This kind of analysis is typically free at your brokerage or investment company like Fidelity or Vanguard.
The very powerful and free tools that do statistical analysis, backtest analysis, asset correlations, factor analysis, portfolio optimization are useful in context but in no way capable of doing what our software does which is to reveal an endogenous lifetime spending amount, accounting for you changing federal and state taxes, your future receipts like Social Security, pensions, declining mortgage, inflation . . . pretty much any sort of expense or receipt with whatever tax consequence you can imagine and account for that in its calculation of smooth annual discretionary spending over a lifetime. This spending amount can serve as a mathematical benchmark against which you can measure the impact of any financial event: How does spending an annual sum of $36 or $36,000 15 years from now change my spending this year and every year thereafter? How much is this lifetime annual spending changed if I postpone SS til I'm 70? If I assume an average nominal return on my retirement assets of 6% instead of 5.75%, how much would my annual discretionary spending change? The list of such "what if's" is up to the imagination.