******** and firecalc are fairly close when I tweak both so that the inputs matched closer (I used the "display (hide).input data" link in firecalc to see what it was assuming, and then changed things as I could). E.g., ******** only supports s&p500 as a stock allocation, whereas FireCalc defaults to a mix of different caps.
As for the result output, it took me a while to understand FireCalc's
.
As near as I can tell, they're graphing the same data, just in a different way.
Both calculate backtests of portfolio balances assuming an historical start date.
******** chart shows you each retirement starting on the historical date, so you'll get a line from 1871 to 1901 (for a 30 year retirement), another for 1872 to 1902, etc.
FireCalc seems to create the same lines, but plots them from year 1 to year 30. You don't see the period for which the portfolio is being backtested.
Firecalc gives some stats in the prose above the chart. ******** gives stats in tables below chart.