Like many questions here, it depends on your capabilities, interest and specific needs - what works perfectly for one, may be useless to someone else. I want to “see the work” when it comes to financial decisions as big as retirement financial plans - the difference between a good and bad plan is 6-7 $ figures for many. And some significant mistakes can’t be undone. I wouldn’t just take someone’s (or some online calculator) recommendations without proof…
Not for the faint of heart, but the most convincing decumulation planning tool I found was
https://www.incomestrategy.com/. A $20 subscription for just one month was all I needed to actually show me why I needed to do Roth conversions among other things. None of the free ones even come close to proving the case, some are “black boxes” - not convincing IMO.
Not what you asked for, but something re: decumulation that stuck with me long ago (just something to keep in mind)
https://www.financialplanningassoci...w Strategy for Managing Retirement Income.pdf
And as others have already said, this place and bogleheads are the best sounding boards I know of.