Software For Order Management

Order management sits between the place an order is taken and the place it is fulfilled. On a small scale that gap is trivial and a spreadsheet handles it. It stops being trivial the moment you sell the same stock through more than one channel, because then two systems both believe they have the last unit.

We sell source code you clone and run yourself, so there is nothing hosted here. For a single sales channel, the order management built into your storefront or accounting package is very likely enough, and this page tries to be clear about where that stops being true.

What an OMS does that a storefront does not

The second row is the whole category in one line. A count of how many units exist is not the same as a count of how many you can safely sell, and the difference is everything reserved by a pending order, allocated to a picker, or already committed to a channel that has not yet told you.

Available to promise is the concept worth learning

Most order management pain traces back to conflating three numbers.

The mechanism behind a correct reservation is worth naming, because it is the part people rebuild badly. Checking availability and then writing the order is a race: two orders for the last unit both pass the check and both get written. The fix is to make the decrement and the order insert one atomic operation with a constraint that forbids negative availability, so the second one fails rather than succeeding quietly.

Where the free and low-cost options land

Zoho Inventory turns up throughout this search for a reason: it does multi-channel stock with order management at a price that suits small sellers, and it has a free tier. Odoo covers the same ground with an open source core. If you already run accounting software, check what it does with orders before buying anything, because the double entry into accounts is the integration people forget to cost.

The point where these stop being enough is usually one of three: fulfilment from several locations with routing rules, a channel nobody supports, or order volumes where per-order pricing becomes uncomfortable.

When building is the right call

What you would start from here

There is no order management in this stack. No product model, no stock levels, no orders, no reservations, no fulfilment, and no channel integrations.

What the Vault template gives you is the application those would live in: organizations as the tenancy boundary, roles and invitations, a Hono backend with Prisma and Kysely on Postgres, an admin app for support, and Stripe billing for charging your own customers. Stripe here is for your subscription revenue, not for taking payment on the orders your users process, which is a separate decision with its own compliance questions.

The parts you write are the product and stock models, the order and line item, the reservation with the constraint that makes it safe, and the fulfilment records. If you need carrier labels or tax calculation, integrate rather than implement; both are their own industries and both are somebody else's bill.

Below is the tenancy, admin, and billing layer. Weigh it against the three stock numbers above, and if Zoho or Odoo already answers your case, that is the cheaper answer.