1) It started off based off ACT, but Oldsgoth basically said he's been too busy to really pay attention to it ( See here: https://mods.factorio.com/mod/Actual_Craft_Time/discussion/5c782ac5ad7f44000c7da4ec)
And Comet's mod is now deprecated: https://mods.factorio.com/mod/ActualCraftTime
And I really needed something like it so after looking through the code from ACT I ended up tearing out most of it and rewriting it. Hence, the name.
What is different:
1) You get a button to open the calculator which lets you add the selected factories to the panel
2) You can shift the multiplier for each one, which makes it super easy to mix & match the number of products
3) I didn't re-implement the calculations for the inserters, since at best it was a guess, and I play with Bob's configurable inserters so it would be pointless for me :)