Two-way
Shopify and eBay inventory sync
A sale on either eBay or Shopify updates the other automatically. Includes automatic eBay listing revision, so your listings stay accurate as stock changes.
View eBay IntegrationShopify Inventory Sync
Shopify inventory sync across eBay, Etsy and Amazon
When a product sells on one channel, its stock needs to change everywhere else. InfoShore's apps keep Shopify and your marketplaces aligned automatically — so you prevent overselling and stop updating stock by hand.
The problem
Multi-channel selling is where overselling starts
Selling on more than one channel is one of the best ways to grow. It's also the fastest way to oversell. The moment your catalog lives in two or three places, every sale on one channel makes the stock count on the others wrong — and you find out when a buyer orders something you can't ship. Multi-channel inventory sync is how you prevent overselling: one sale updates your stock everywhere, so no channel keeps selling something you've already sold.
Without sync
What manual inventory costs you
- You sell the last unit on two channels before either updates
- Every sale means re-typing the same number in two or three places
- A sold-out product stays live on a channel you forgot to update
With InfoShore
What changes
- One sale updates your stock across every linked channel
- Products link by SKU, so the right listing always updates
- You prevent overselling instead of apologising for it
How it works
Three steps to accurate stock everywhere
STEP 01
Link products by SKU
The apps match your Shopify products to their marketplace listings — automatically by SKU, then manually for anything that doesn't match cleanly.
STEP 02
A sale changes the count
When an order lands on any linked channel, that sale registers against your stock.
STEP 03
The other channels follow
Stock updates across your linked channels automatically, so the next buyer sees the true number — not a sold-out product still taking orders.
What it does
Inventory sync, in detail
Shopify inventory synchronization built around SKUs, variants and real catalog sizes — so the number a buyer sees is the number you actually have.
Automatic
Automatic inventory updates
Stock changes flow across your linked channels on their own, without a manual run. No spreadsheet, no re-typing.
Quantity
Quantity synchronization
The available count stays aligned between Shopify and each marketplace, so every channel shows the true number.
SKU
SKU-based matching
Products link by SKU — first automatically, then manually for anything that doesn't match cleanly — so the right listing updates every time.
Variants
Variant-level inventory
Each variant syncs its own count. A sale of one size or colour only affects that variant, not the whole product.
Overselling
Overselling prevention
Because stock stays aligned across channels automatically, you stop selling units you no longer have.
Scale
Built for real catalogs
Some merchants run tens of thousands of listings through these apps. Inventory sync is built for that, not a demo store.
Marketplace coverage
Inventory sync for each channel you sell on
Two-way for eBay and Etsy. One-way, Amazon to Shopify, for the Amazon importer. Each app is built for its own marketplace.
Two-way
Shopify and Etsy inventory sync
Etsy and Shopify keep the same stock count, and Etsy orders arrive in Shopify ready to fulfill. Prices can carry a markup that covers Etsy's fees.
View Etsy Integration
One-way
Amazon to Shopify inventory sync
PRO Importer for Amazon brings your Seller Central catalog into Shopify and keeps inventory and price updated from Amazon on a schedule. It doesn't push Shopify stock back to Amazon, and doesn't read Amazon orders.
View PRO Importer for AmazonQuestions
Inventory sync, answered
Automatically, whenever a linked product's stock changes. How fast an update lands depends on each marketplace's API, which queues and rate-limits changes — so we won't promise instant. In practice most updates land within minutes.
Yes. Each variant keeps its own inventory count, so a sale of one size or colour only affects that variant.
Yes. The apps are built for real catalogs — some merchants run tens of thousands of listings through them.
The Amazon app is a one-way importer, so it keeps Shopify updated from Amazon on a schedule — it doesn't sync Amazon orders back. For two-way, order-driven stock sync, that's the eBay and Etsy apps.
Yes — keeping your stock synced across every channel automatically is how you prevent overselling, instead of catching it after the fact. Sync runs automatically as sales happen; because each marketplace's API controls the exact timing, we keep your channels aligned continuously rather than freezing a sale mid-checkout.
Related guides
Learn how it fits together
Not sure which app you need?
Tell us what you sell and where. We'll point you to the right app — and if you run more than one channel, they work side by side.
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