SHOPIFY INVENTORY SYNC

Real-time Shopify inventory sync across stores, warehouses, and suppliers.

For brands running more than one Shopify store, warehouse, or supplier feed, where stock levels drift apart and someone fixes them by hand. We build custom sync apps and middleware that keep one source of truth for inventory and push it everywhere it needs to be.

One inventory source across every store and location
Real-time product and variant sync through the Shopify Admin API
Out-of-stock detection and replacement matching

Real-time sync across 5 stores · 10+ years in production

5 stores

Synced in real time

200,000+

SKUs on a system we built

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SOUND FAMILIAR?

Your stock numbers do not agree with each other.

Each Shopify store shows a different count for the same product.
You oversell because a warehouse or supplier update arrived late.
Someone exports and re-imports spreadsheets to fix stock levels.
Out-of-stock items stay live until a customer complains.
Inventory apps from the App Store cannot handle your store or location setup.
Vendors and suppliers each send stock in their own format.

WHY CHOOSE STACKWORX

We have shipped real-time inventory sync

Midway Inventory runs real-time Shopify inventory sync we built, and Fantasy Middleware keeps inventory in sync across 5 stores in real time. We bring that experience to your stores.

One owner for every number

We agree up front which system owns stock for each location, so syncs never fight each other.

Built for your setup

Multiple stores, warehouses, and supplier feeds handled the way your operation works, not the way a generic app assumes.

Long-term ownership

We stay on to maintain the sync as Shopify's APIs, your catalog, and your stores change.

WHAT WE BUILD

Inventory sync built around how your stock actually moves

01Core

Multi-store inventory sync

One inventory source pushed to every Shopify store in real time, so the same product shows the same stock everywhere.

Shopify Admin API
Real-time
Multi-store

Warehouse and location stock

Inventory organized by exact warehouse location, feeding the counts each store and channel sells from.

Supplier and vendor feeds

Vendor workflows and API connections that turn supplier stock updates into accurate Shopify inventory.

Out-of-stock handling

Automated out-of-stock detection and replacement matching, so sold-out items are handled before customers find them.

Central portal

A single portal for inventory, products, vendors, and combined orders across stores.

Monitoring and ownership

Sync errors surface instead of failing silently, and we maintain the app long-term.

18.5M+
Transactions in production
200,000+
SKUs managed
5 stores
Synced in real time
10+ yrs
In production

Proof · Midway Inventory

A Rails inventory system synced with Shopify in real time.

For Midway Sports we built a Rails-based inventory system integrated with Shopify's Admin API. It handles real-time product and variant sync, out-of-stock detection, and automated replacement matching across multiple sales channels from one unified inventory source. Midway's order and inventory system manages 200,000+ SKUs. For Fantasy Middleware we built real-time inventory sync across 5 stores, with a centralized portal, API connections, product sync, vendor workflows, and combined orders.

Book a Discovery Call

Midway inventory system with real-time Shopify sync

HOW IT WORKS

From drifting stock counts to one source of truth.

01
Discovery call
A 45-minute call on your stores, locations, suppliers, and where stock goes wrong today.
02
Map the stock flow
We decide which system owns each number and how updates move between stores, warehouses, and suppliers.
03
Build and test the sync
A custom app or middleware built against the Shopify Admin API and tested against your real catalog.
04
Monitor and own it
Errors are logged and alerted, and we maintain the sync as your catalog and store setup change.

WHAT CLIENTS SAY

Partners, not vendors

Farooq did an excellent job with our Shopify inventory sync integration. He clearly understands Shopify app integrations and implemented real-time stock synchronization smoothly and efficiently. Communication was clear, deadlines were met, and everything works perfectly. Highly recommended!

elena_nevex

Fiverr client, United States

Fiverr review

FAQS

Frequently asked questions

Can you sync inventory across multiple Shopify stores?

Yes. We build custom sync apps and middleware that keep one source of truth for inventory and push it to every Shopify store in real time, so the same product shows the same stock everywhere.

Can warehouse and supplier stock feed into Shopify?

Yes. Inventory can be organized by exact warehouse location, and vendor workflows and API connections turn supplier stock updates into accurate Shopify inventory.

What happens when an item goes out of stock?

Automated out-of-stock detection and replacement matching handle sold-out items before customers find them.

Have you built Shopify inventory sync before?

Yes. For Midway Sports we built a Rails-based inventory system integrated with Shopify's Admin API, and Midway's order and inventory system manages 200,000+ SKUs. For Fantasy Middleware we built real-time inventory sync across 5 stores.

Stock counts drifting between stores? Let's map the fix.

Book a 45-minute Systems Discovery Call. You leave with a clear plan for how your inventory should sync, whether you hire us or not.