Roth conversion calculators

For Roth conversions what calculators do you like the best.. Seems like in the free arena there are only 2. Do you favor any? Any better than the two (iORP and Retiree Portfolio Model)? Why?
d. Both seem to imply that conversions save money on total lifetime taxes as far as I can see— are the minds on this forum confident of this? I know that there are calculators I might pay $40, 50 or $99 for like MaxiFi, PRC Gold, etc—do folks feel they offer advantage over the information gleaned from the free ones?

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