Stock systems fail in two ways: numbers drift, or orders oversell. Inventra records every stock change as a movement on an append-only ledger and updates quantities inside database transactions, so on-hand stock stays explainable.
It is built with Next.js 15 and MongoDB, with a read-only live demo and ten one-click demo logins, from warehouse manager and cashier to B2B customer and vendor.
Updated 25 October 2026
What is included
Multi-facility stock: warehouses, fulfilment centres, shops and 3PLs with bins, batches, serials and FIFO / FEFO cost layers
Purchasing with emailed purchase orders, receiving, ASNs and vendor scorecards, plus a vendor portal
Sales with contract, volume and tier pricing, credit holds, pick, pack and ship, returns and credit notes
Point of sale with barcode scanning, split tenders, register shifts and an offline sale queue that syncs when the connection returns
Logistics documents, a B2B ordering portal and a double-entry ledger with P&L, balance sheet and cash flow
Questions to ask of any inventory system
Can every stock number be traced to the documents that changed it?
What happens when two orders reserve the last units at the same time?
Does it cost stock by lot or expiry, not just an average?
Can the shop keep selling when the internet drops?
