Guides

What every Shopify inventory sync app costs

The free plan, the cheapest paid plan, the top published plan and what each one is charged by, for 30 Shopify apps that keep stock in sync between stores or between products sharing a SKU. Every price read from each app's App Store listing on 2 November 2026.

Updated 2 November 2026

The short answer: the cheapest app to keep stock in sync between Shopify stores is Zync, which is free, on 3 reviews. The cheapest paid plans are UniSync ($4.99 a month per store connection, unlimited products, 3.7 stars from 7 reviews), Inventory Sync ‑ GoGo ($4.99 for 1,000 syncs a month) and Gro ($5.99 per connected store, up to 100 products). Among apps with more than 100 reviews, Tipo is cheapest at $9 for up to 1,000 variants, then Synkro at $10 for 1,000 products.

StockUnison, which we make, is not the cheapest entry: it keeps up to 50 SKUs in sync free across every store, then $19 a month for 2,500 SKUs with every store included, or $9 a month for products sharing a SKU inside one store. What it does differently is the meter: adding a store never adds a charge.

Every figure below was read from each app’s own Shopify App Store listing on 2 November 2026, in US dollars a month as a US visitor sees them. The App Store shows visitors elsewhere an estimate in their own currency.

Apps that sync stock between stores

Sorted by the cheapest paid plan. † marks an app that also keeps products sharing a SKU on one count inside a single store.

Prices are the US-dollar monthly prices on each App Store listing; yearly billing is cheaper on most. Synkro’s “per installed store” comes from its own FAQ, not its App Store listing.

Apps for products sharing a SKU in one store

These keep every product carrying the same SKU on one count inside a single store — a mug sold on its own and in a gift set, for example. Sorted by the cheapest paid plan.

Trunk also syncs duplicate SKUs, on its Pro plan from $39.

Cheapest by situation

• Free, for good: Zync, on 3 reviews.
• Free while the catalogue is small: Tipo (250 variants), StockUnison (50 SKUs across every store), Easify (50 products across stores), Syncio (25 products), Multi Store Sync Power (25 products per connected store), Horse (50 sales a month), and syncX (2,000 products, updated by hand).
• The lowest paid price between two stores: UniSync, $4.99 a connection with unlimited products, on a 3.7 rating from 7 reviews.
• The lowest price with a long review record: Tipo, $9 for 1,000 variants (4.8 from 147), and Synkro, $10 for 1,000 products (5.0 from 109).
• Three or more stores: a per-store price multiplies. With a main store and three connected stores, SyncLogic’s $19.99 a connected shop is $59.97 a month, and UniSync’s $4.99 a connection is $14.97. StockUnison, HubStock and Easify include several stores in one plan.
• A large catalogue: UniSync has no product limit at $4.99 a connection; Easify’s $59.99 and Synkro’s $100 cover unlimited products; StockUnison’s $59 covers 100,000 SKUs and $99 covers 250,000, every store included. Tipo publishes no plan past 50,000 variants and Syncio none past 1,000 products.
• Products sharing a SKU in one store: SKU Stock Sync from $4 plus a charge per sync, VSI from $4.99, Duplicate SKU Sync Master from $5, StockUnison $9 for 10,000 SKUs.

Read the meter before the price

The price on the card is rarely the bill. What each app counts decides what you pay as you grow, and the same shop can land on a $5 plan or a $100 one depending only on that.

• Charged per store. SyncLogic, UniSync and Gro charge for each connected store, Synkro for each store with the app installed, and QuickSync for each shop past the two included. A third store is a third bill.
• Charged by Shopify plan. VSI, SimpleSync, Duplicate SKU Sync Master and Flo price by the Shopify plan you are on, not by your catalogue, so upgrading Shopify raises the bill on its own.
• Charged by orders or sales. Trunk, Sumtracker and Horse. A small catalogue that sells hard pays more here. Sumtracker’s limit is 2,500 orders a year, not a month.
• Charged by syncs. GoGo, SKU Stock Sync and Easify’s single-store free plan count updates, so a busy week costs more than a quiet one. SKU Stock Sync bills each sync past the included amount.
• Charges outside the plan. Syncio’s listing says “Orders, Product Settings, and Payouts Add-on charges apply separately”. syncX adds $5 to $7 for each extra feed. Sumtracker, Multi Store Sync Power, Trunk and Syncio point larger shops to prices on their own sites.
• Free plans that don’t cover a live store. Duplicate SKU Sync Master and Flo offer free plans only to development, trial and paused stores, and HubStock’s free plan is only for the connected stores, with the main store paying.

Products, variants and SKUs are different counts. A shirt in four sizes is one product, four variants and four SKUs. An app that counts products is cheaper for a catalogue with many sizes and colours; one that counts variants or SKUs is cheaper for a catalogue of single items.

What StockUnison costs, and what it counts

StockUnison counts SKUs kept in sync, and a SKU is counted once however many stores carry it. Every store is included; the main store, or the store that started sharing, pays, and stores that join install free.

Matching, preview mode and checks are free at any catalogue size, so you can see exactly what it would change in your real stores before paying anything. It keeps stock in sync two ways — one shared count across stores, two-way, or one main store’s counts copied into the others — and it does not copy products or prices, or sync marketplaces. It launched in August 2026 and has no reviews yet. The pricing page has the details.

Prices, plan limits, ratings and review counts read from each app's public Shopify App Store listing on 2 November 2026, in US dollars a month as a US visitor sees them; every app name links to the App Store listing its figures came from. The list is the apps most often compared in this category, every app on the first page of App Store search for "same sku" or "duplicate sku" with duplicate SKUs in its name, and the best-ranked other store-to-store sync apps on the first page for "inventory sync multiple stores" and "multi store sync". Six more on those pages were left out to keep it to 30: Multify ($499), Salestio, Secure Multi‑Store Sync, Twinstock, Linkly and MirrorSync. Prices change — check today's before you decide.