How SKU Stock Sync works
What the app does
SKU Stock Sync keeps inventory aligned between product variants that share the same SKU at the same Shopify location. If two or more variants match on both SKU and location, the app helps keep their stock levels in sync.
This helps reduce overselling by making sure matching variants stay aligned instead of drifting apart.
In this app, a SKU/location group means all variants that share the same SKU at one specific Shopify location.
How syncing happens
SKU Stock Sync does not run a full store-wide inventory sync on demand.
Instead, it watches for inventory changes. When stock changes for a matching SKU at a Shopify location, the related SKU/location group is marked as due. Due groups are then synced on a schedule.
You can also manually sync groups that are already due if you want them processed sooner.
Manual syncing only processes due groups. It does not force a full sync across your entire store.
What this means for you
Matching variants stay aligned: Variants with the same SKU at the same location are kept in sync.
Syncing is event-based: The app reacts to inventory changes instead of repeatedly syncing your whole catalog.
Scheduled processing: Due groups are picked up and synced automatically on a schedule.
Manual control when needed: You can manually sync due groups if you do not want to wait for the next scheduled run.
If you are trying to understand why a variant did or did not sync, first check whether it shares the same SKU and Shopify location as the other variant.