Most purchase order systems are paperwork tools. They make the document, route the approval and file the PDF. The hard part happens before any of that: deciding what to order, how much, from whom, with a budget that never stretches far enough. That is the part Optimal Chain does.
The purchasing problem PO tools do not touch
Search for purchase order software and you will find approval workflows, PDF generators and three-way matching. All useful, all administrative. None of it answers the question that decides whether your quarter is good or bad: with the money available, which products, which suppliers, what quantities, in what order of priority?
In most stock-holding businesses that decision is made by a buyer with a spreadsheet, juggling hundreds of products, dozens of suppliers, minimum order quantities on everything and a budget that will not cover it all. It takes days, it goes stale the moment a supplier changes a price, and the trade-offs are invisible. Order too much of the comfortable lines and the best sellers run out. Spread the budget thin and every supplier's MOQ breaks the plan.
Give it your budget. It writes the order plan.
Optimal Chain starts where the paperwork tools stop. Upload a sales export, and every product gets its own demand forecast, built by a tournament of 18 forecasting methods and blind-tested against that product's own history. From there, the Replenishment Budget Planner takes over. This is what it looks like on a live catalogue (demo data):
Every MOQ respected · most urgent revenue funded first · re-plans in milliseconds
Per-supplier allocation · top of 38
Far East Textiles Co£64,200
Midlands Fixings Ltd£45,850
Nordic Components AB£35,300
Precision Parts SRL£24,700
34 more suppliers£80,950
Drill into any supplier for the line-by-line PO, MOQ multiples shown on every row
Type in the budget. £50,000 or £750,000, whatever this month or quarter allows.
Every pound is allocated by urgency. Products are scored by expected stockout cost: daily revenue at risk, exposure window, and how critical the line is. The budget protects the most valuable revenue first, not the products at the top of the alphabet.
Every MOQ is respected. Each order quantity is zero or a valid multiple of the supplier's minimum. A pre-reservation step protects small-but-vital suppliers whose chunky MOQs would otherwise price them out of the plan.
It re-plans instantly. Drag the budget slider and the entire order book re-solves in milliseconds, in the browser. Ask your ERP to do that.
The result is a complete, placeable purchase order plan: per-supplier drill-downs, per-product reasoning, and an export formatted for your ERP. What took a buyer three days takes a slider drag.
Before the PO is placed: is that supplier deal actually good?
Purchase orders and supplier offers arrive together. A supplier says 8% off if you take 5,000 units. Most buyers judge that on the price alone. Optimal Chain's Deal Optimiser judges it on the full cost: the purchase saving, the extra holding cost of the bigger batch, and the queue effect, because new stock sits behind the stock you already hold, and every month in the queue costs money. It compares up to 8 pricing tiers at once, finds the quantity that maximises the net saving, and gives you the exact break-even price to four decimal places: the walk-away number for the negotiation. A 10% discount that loses you money is spotted before the PO exists, not at the year-end stock count.
Deal Optimiser · SKU-B270 · offer: 8% off at 5,000 units
+£9,840
-£4,310
-£2,150
+£3,380
Price savingExtra holdingQueue penaltyNet saving
Break-even negotiation gauge
Offered price
£11.0400
Walk-away price
£11.6212
Room to negotiate£0.5812 / unit
Verdict: GOOD DEAL · optimal quantity 6,200 units saves a further £940
And when the supplier lets you down
Lead times slip. Prices rise mid-quarter. The Disruption Planner stress-tests the whole order book: add ten days to every Far East supplier, add a 5% surcharge, or both, and see the damage in pounds along with the adjusted purchase orders to cover it, usually in about a minute. The adjusted POs export just like the normal ones.
What is the difference between purchase order software and a PO module in my ERP?
Both create and track POs. Neither tells you what the order should contain. Optimal Chain forecasts every product individually, works out what needs ordering and when, and fits the plan to your actual budget, respecting every supplier's MOQ.
Can it work within a fixed purchasing budget?
Yes, that is the core of it. Type in the budget and the plan allocates it to the penny, most urgent revenue first. Move the slider and the whole order book re-plans instantly.
Does it handle supplier MOQs?
Every quantity is zero or a valid MOQ multiple, small suppliers are protected from being starved of budget, and the MOQ Intelligence view shows what each supplier's minimums cost you per year.
Send a sales export from whatever system you run and get a live dashboard built from your own products: forecasts for every line, the stock risks, and a budget-ready purchase order plan. No card, no sales calls.