Free Shopify channel sync audit — see every SKU where your store and your warehouse disagree, with $ impact.
Every SKU whose channel quantity drifts from your warehouse count is a sale you cannot make or stock you cannot see. This audit compares the two, SKU by SKU, and ranks every gap by dollar impact — the method is below, free.
The short answer
A channel sync audit compares the quantity each sales channel believes it can sell against the quantity your warehouse actually holds, SKU by SKU, and prices the gap. Ranking by dollar impact rather than by unit difference is what matters: a three-unit gap on a high-value SKU usually costs more than a fifty-unit gap on a cheap one.
Drift is normal — unexamined drift is not
Channels and warehouses decrement stock at different moments in the order lifecycle, so some disagreement is expected at any instant. The question is not whether the numbers differ but whether the difference is bounded, explainable, and shrinking.
An audit turns a vague sense that the numbers are off into a ranked list with a dollar figure against each line, which is the difference between a worry and a work queue.
Two directions of error, two different costs
When a channel shows more stock than the warehouse holds, you oversell: the customer buys something you cannot ship, and you pay in refunds, support time, and on marketplaces potentially in account standing. When a channel shows less, you undersell quietly — stock sits unsold and nothing alerts you, because nothing appears to be wrong.
Overselling hurts more per incident, but underselling usually costs more in total because it goes undetected for far longer. An audit is the only thing that surfaces the second kind.
Frequently asked questions
What is a channel sync audit?
A SKU-by-SKU comparison of the quantity each sales channel believes it can sell against the quantity your warehouse actually holds, with the dollar impact of each gap ranked so you can start where the money is.
Should channel and warehouse quantities ever differ?
Some difference is expected, because channels and warehouses decrement stock at different points in the order lifecycle. What matters is that the difference stays bounded, explainable, and reconciled on a schedule.
Which is worse, overselling or underselling?
Overselling costs more per incident through refunds, support time, and marketplace standing. Underselling usually costs more in total, because stock sits unsold with nothing to alert you and the problem persists far longer.