There's a whole industry of people selling inventory spreadsheets they've never used.
You've seen them. Someone opens ChatGPT, types "make me an inventory tracker," screen-records it for thirty seconds, and starts selling the result for $19. Three columns — item, quantity, price — and a confident voice telling you it'll "change your business." It won't. You'll still stock out of your bestseller on a Friday and still have cash frozen in a product that won't move.
I know, because I've spent fifteen years actually running supply pipelines — not theorizing about them, running them. Forecasting demand, sizing safety stock, fighting lead-time variability. I run that math every single morning before I even turn my platform on, and I've done it for fifteen years. It answers the only two questions that actually matter: what do I reorder, and when?
Par Level is what I wish every small operator had. It's the real math — reorder points, service-level safety stock, Economic Order Quantity, ABC analysis — packaged so you don't need a supply-chain degree to use it. You fill in a few columns. It tells you exactly what to buy now, how much, and what it'll cost you. That's it.
No fluff. No guru energy. Just the system a professional would build for themselves — built by someone who has.
— Kyle, Par Level (a Bartlett Labs project)