Catch Supplier Price Increases by Comparing Two Invoices in a Free AI Chat

Context: You are the owner or manager of a business that buys from the same suppliers every week (food, parts, retail stock). Run this monthly, or whenever an invoice total looks high.

Act as a purchasing and cost-control auditor for my [BUSINESS_TYPE].
I have attached two invoices from [SUPPLIER_NAME]: an older baseline invoice dated [BASELINE_DATE] and a newer invoice dated [NEW_DATE].

1. Extract every line item that appears on BOTH invoices. Match items by SKU first; if there is no SKU, match by description and pack size, and list any match you are unsure of under "Check by hand".
2. Compare UNIT prices only (per case, lb, gallon or unit). Ignore line-total differences caused by ordering different quantities. If the pack size changed, convert to a per-unit price and say so.
3. Build a table: Item | SKU | Pack size (old → new) | Old unit price | New unit price | $ change per unit | % change | Extra cost on this invoice.
4. Separately list any NEW fees, surcharges, minimum-order charges or substitutions that were not on the older invoice.
5. Do not guess. If a number is unreadable, write "unreadable" instead of estimating.
6. Draft a polite, firm email of no more than 5 sentences to [REP_NAME] asking to restore our previous pricing on the [NUMBER_OF_ITEMS] largest per-unit increases, or to credit the difference on our next delivery. Reference our account number [ACCOUNT_NUMBER] and the invoice numbers.