When you sell on both Etsy and Shopify, Shuttle's Stock Syncer keeps stock levels in step between your Etsy shop and your Shopify store, so you avoid overselling and don't have to update stock by hand. When stock changes on one side, for example after a sale on Shopify, Shuttle updates the matched product on the other side automatically.

The Stock Syncer only works on products that are matched between Etsy and Shopify, so a product needs a match before its stock can sync.

The Stock Syncer can sync in two directions, and you turn each one on separately:

You can turn on one direction or both, depending on how you manage your stock.

If a product is not matched yet, see Matching Products & Variations.

The Stock Syncer syncs stock quantities between matched products and variations.

The Stock Syncer can also sync SKU changes between platforms once you turn this on in the settings.

The Stock Syncer can keep a product's state the same on both sides. For example, when an Etsy listing is deactivated, Shuttle can set the matched Shopify product to draft, and it works the other way round too.

The Stock Syncer lets you choose what happens to the Shopify product when a product sells out on Etsy.

See Handling Sold-Out Etsy Products in Shopify.

The Stock Syncer lets you choose how negative stock is handled.

See Handling Negative Stock When Syncing Quantities from Etsy to Shopify.

You can leave certain products out of the Stock Syncer, either by tag or by excluding digital products.

See Control Stock Syncing Using Product Tags and Excluding Digital Products from Stock Syncing.

The Stock Syncer keeps a history of every sync, so you can see what was updated. If a sync fails, the history shows the reason, often with a link to a help article that explains it.

The Stock Syncer never changes a product's title, price or images. It only updates stock, plus SKUs and product state when you turn those on in the settings.

The Stock Syncer skips Etsy draft listings when it syncs from Etsy to Shopify. Stock changes you make on a draft listing on Etsy are not copied to Shopify.

The Stock Syncer treats Shopify POS sales and sales from your other sales channels exactly like online orders. After the sale, Shuttle reads the variant's current quantity in Shopify and sends it to the matched Etsy listing.

POS orders also count toward the Stock Syncer order limit, just like any other paid order.

Shuttle sends Etsy the quantity from one Shopify location for each variant, unless you choose to send your combined quantity across all locations. You set this in the Shopify inventory location section of Settings > Products > General.

The Stock Syncer only reacts to stock changes made after you turn it on. Quantities that already differ between Etsy and Shopify are not lined up when you switch it on, so make them match first.

See Review and fix quantity mismatches between Etsy and Shopify.

The Stock Syncer comes with the Growth, Scale and Max plans. It is not included in the Essential plan.

To use the Stock Syncer, you need the Growth plan or higher.

Each plan that includes the Stock Syncer covers a set number of orders per calendar month:

Only paid orders that include at least one matched product that is not excluded count toward the Stock Syncer limit. Your count resets on the 1st of each month, and you can see your usage on the Stock Syncer page.

For what counts and what happens when you reach your limit, see Understanding Stock Syncer Limits.

You can start a free 14-day Stock Syncer trial on the Stock Syncer page if you have not used the Stock Syncer trial before and have never had a plan with syncing.

To compare plans, see Shuttle's Available Plans.