The job this tool does, and who does it today
Somewhere in the last quarter of the year, a founder or a sales director commits to a number. That number then has to become something a rep can act on in the second week of February. The distance between those two things is where most sales plans fall apart.
Today the split is usually done by the sales head in a spreadsheet over a weekend. The annual figure is divided by twelve, then by the number of reps, with some manual nudging for the reps everyone knows are stronger. New joiners get a full quota because reducing it feels like lowering the bar. Nobody writes down the assumptions, so when the plan misses in month three, the argument is about effort rather than about a distribution that was never realistic.
A sales target splitter's job is to make the assumptions explicit and the arithmetic reproducible, so the plan can be argued about before it is committed.