Has anybody seen this? Do you know if it's any good??

[HandyAndyTheAmateur]

I've recently used this site ( https://builderscalc.pro/ ), to spec out and price a couple of jobs (for painting and mulching - so, simple and basic tasks), and it looks to be pretty close, but I'm unsure of its overall accuracy. Have any of you guys (and gals) used it before, and have you got any opinions on it it??