Search for software to “manage orders and stock” and you'll find two kinds of product that sound alike but solve different problems: order management systems (OMS) and warehouse management systems (WMS). Buying the wrong one is an expensive way to find out the difference.
What an OMS does
An order management system sits between your sales channels and your despatch. It typically:
- pulls orders in from marketplaces and webshops into one list;
- keeps stock levels in sync across those channels;
- prints carrier labels and sends tracking back to the channel;
- handles cancellations, refunds and customer details.
In short, an OMS knows what has been sold and how much you have in total. It usually doesn't know where in the building each unit is.
What a WMS does
A warehouse management system runs the physical side:
- bin locations, so every unit has an address;
- picking lists that send pickers along a sensible route;
- barcode scanning to confirm the right item, from the right bin, in the right quantity;
- goods-in and put-away against purchase orders;
- stock counts, transfers between bins and between warehouses.
A WMS knows where everything is and makes sure the right thing leaves the building.
Signs you've outgrown an OMS on its own
- Only one or two people know where things are, and holidays are a problem.
- New staff take weeks to pick accurately.
- Wrong items or wrong quantities go out often enough to notice in returns.
- Your stock figure is right in total but you still can't find the item.
- You've added a second building, a mezzanine or an overflow unit.
- Stock-takes take days and the results are always a surprise.
Signs you don't need a WMS yet
If you ship a few dozen orders a day from a small room, with a short product range one person can hold in their head, a good OMS and tidy shelves may be enough for now. A WMS earns its keep when the warehouse, the range or the team grows beyond what memory can manage.
Why the two work better together
Run them as separate products and you have two copies of your stock that need keeping in step. Orders arrive in one system and are picked in another, and every mismatch becomes a manual job. When order management and warehouse management share one stock record:
- an order reserves stock in a specific bin as soon as it arrives;
- the pick list sends the picker to that bin;
- the scan confirms it, and despatch takes it off the books;
- if the order is cancelled after picking, the system knows the item is in a tote and asks for it to go back to the shelf.
Questions to ask any supplier
- Do orders and warehouse stock live in one database, or are they synced between two products?
- Is every pick confirmed by a barcode scan, or just ticked off?
- Can it handle more than one warehouse, and transfers between them?
- What happens to stock when an order is cancelled after it has been picked?
- Which of my channels and carriers are connected today, not on the roadmap?
Where Ops2Sell fits
Ops2Sell is one system for both: orders from your channels, and a scan-verified warehouse with bins, picking, counts and transfers, on the same stock. Our pricing is a flat monthly plan sized by order volume, and the comparison page sets out how it differs from order-only tools.