One subscription, however many Shopify stores you connect.

SKUs kept in sync, and nothing else. A SKU counts once however many stores or products carry it, so connecting another store costs nothing more. Not orders, not your revenue, not how many stores join. It is worth checking this on every app you compare: the same shop can be cheap on one pricing axis and unaffordable on another.

One store, and it is always the one that set the arrangement up: the main store whose counts everything else follows, or the store that started sharing its stock. Every other store installs StockUnison free, however many join. One subscription covers the whole setup.

The same SKU count. Each SKU on two or more products counts once, however many products or stores carry it. A store sharing stock on its own is covered up to 10,000 SKUs from One store at $9/month; once another store shares with it, the plan's main limit applies — 2,500 SKUs on Starter, 10,000 on Growth, and so on.

Up to 50 SKUs, yes — that is the free plan. Checking is free at any size: StockUnison reads your catalogue and shows you exactly which products carry the same SKU and what would change, for as long as you like. Going live with more than 50 SKUs sharing is One store, $9/month, up to 10,000 SKUs.

SKUs being kept in sync live: the matched SKUs of a connected store that is live, or the SKUs sharing stock once sharing is live. A store in preview mode or paused does not count, so you can connect and preview as many stores as you like on any plan, including Free.

Nothing stops. Everything that is live keeps syncing, because stopping halfway through a catalogue is how stock gets oversold. The app asks you to move up the next time you go live, update or press Sync now.

Nothing is disconnected and no history is lost. The oldest live connections the new plan still covers stay live, any others drop to preview mode, and the app tells you which ones moved. Shared stock moves as one: if the new plan no longer covers it, the whole arrangement drops to preview rather than half of it staying live, because stock shared between stores is one thing and half of it is not a smaller version of it.

Through your Shopify invoice, alongside everything else you pay Shopify for, monthly or yearly — a year costs ten months. StockUnison never sees or handles your card. Change or cancel from Settings → Plan → Change plan in the main store, which opens Shopify's own billing page.

No. It is a plan you can stay on indefinitely: up to 50 SKUs kept in sync live, and matching, preview mode, the activity log and the difference checks at any catalogue size — so it is also a genuine way to see what would happen to your real catalogue before paying anything.