Knowing where stock sits is not a plan.
Inventory management and inventory planning get sold interchangeably, and the words are close enough that nobody blinks. They answer different questions, and buying the wrong answer is how a brand with perfect records still runs dry.
Side by side, they stop being confusable.
Management answersthe record
- Where is the stock, right now, across warehouses and channels
- How many units moved, and in which direction
- What is it worth on the books
- Did the order route, pick, pack and ship
Planning answersthe commitment
- What do we order, and how many
- By which date, given the whole lead-time path
- From which supplier, into which node
- What happens to cash and coverage if we are wrong
The left column is what Cin7, in its own words inventory management software and small business ERP, and Brightpearl, in its own words a retail operating system, are built for. The right column is a different purchase.
Perfect visibility of a too-late situation.
A management system records outcomes. By the time a stockout is visible in it, the decision that caused it is months old: an order-by date that passed quietly, upstream of every system that keeps records. On a 90-day lead time, the report that shows you ran dry is a photograph of a decision from last quarter. Records are necessary. They are just not preventive.
The documented version of records without ownership: 280 unreconciled shipments sat in the books until a sweep turned them into 31 filed cases, and the client kept every dollar recovered. The data existed the whole time. The catch →
Records feed the plan. The plan commits the cash.
Run both and the shape is simple: the management system stays the source of record, and the planning layer reads from it, questions it against the marketplace and the 3PL, and turns the reconciled picture into orders with dates. That planning layer is what the In-Stock Engine sells as a managed weekly service: model built once, plan landing before a 30-minute call, senior lead owning the dates. How the weekly cycle runs →
The three questions this page gets.
Do we need an inventory management system before hiring you?
No. The build works from platform exports and supplier terms. If you run an IMS or ERP, the Engine reads from it as a data source. If you do not, exports are enough to start, and buying one is never a precondition we set.
Will you replace our ERP?
No. Management systems and planning are different shelves, and we stay on ours. Your system of record keeps recording. What we add is the layer that decides what to order, when, and what happens to the cash if the answer is wrong.
Which tools count as management and which as planning?
By their own descriptions: Cin7 calls itself inventory management software and small business ERP, Brightpearl a retail operating system. SoStocked and Inventory Planner sell forecasting and replenishment, which is planning. The two lists get shopped interchangeably, and that is how brands end up owning the wrong one.
Cin7 and Brightpearl belong to their respective owners, and their descriptions here are drawn from their own sites, August 2026. Names appear for factual comparison only. No affiliation or endorsement is implied, in either direction.
Talk it through against your catalog.
If your records are clean and you still ran dry, the gap is the right-hand column. Thirty minutes against your catalog will show exactly where.