Spreadsheets and admin tabs
Every channel keeps its own number. You reconcile them after they drift.
Manual after the factWhy StockTruth
A faster copy of the wrong quantity is still the wrong quantity.
The difference is where the sellable decision lives when orders arrive close together.
Every channel keeps its own number. You reconcile them after they drift.
Manual after the factOne channel or app sends counts outward, but timing can still expose stock already claimed elsewhere.
Fast, but timing-ledOrders reserve against a shared sellable ledger before new availability is projected.
Reservation-ledWhen two channels sell the same last unit, someone has to absorb the mismatch.
Customer Cancellation and disappointment
Operator Manual review, messages, and refunds
Store Rating damage and lost confidence

StockTruth does not ask a growing seller to replace shipping, accounting, purchasing, or every channel workflow just to keep availability aligned.
You self-fulfill, sell the same SKUs on multiple channels, and need a shared sellable quantity.
You need multi-warehouse planning, manufacturing, purchasing, accounting, or a complete order suite.
Keep your existing channel tools, and give every listing the same inventory starting point.