Can anyone link to an accumulation phase simulator?

There are plenty of retirement calculators like cfiresim that show how often a given portfolio would have succeeded given historical data, but my google-foo was too weak to find something similar for the accumulation phase.

A sample question such a simulator might answer: Given an inflating adjusted annual savings rate of x, and a target total savings of say 15x, what is the likely hood of hitting 15x each year for a given portfolio (or even just a 100% S&P 500)?