Guides

Multi-Store Sync Power alternatives, weighed honestly

Multi-Store Sync Power syncs inventory, products and collections between Shopify stores — and carries the highest complaint rate among the direct store-to-store apps. What it does well, what its reviews actually say, and which alternatives fit which job.

Updated 26 September 2026

Multi-Store Sync Power, by EGNITION, is one of the two apps most merchants shortlist for keeping several of their own Shopify stores in step — the other being Syncio. It is also the app whose users most often end up reading a page like this one, because its public review record tells a sharper story than its rating does.

This page tries to be fair in both directions: what it genuinely does well, what the reviews actually say, and who should still choose it over anything else — including over the app whose site you are reading.

What Multi-Store Sync Power is good at

• It syncs more than inventory. Products, collections and fields move between stores, in both directions if you want. If your problem is “keep two catalogues identical”, that breadth is the point, and one-way inventory tools do not solve it.
• Multi-location awareness. It can map locations across stores rather than assuming one location per store.
• The price is easy to start with. A free tier, then $19.99 a month. There is no marketplace framing and no supplier/retailer vocabulary to translate — it assumes the stores are yours.
• No supplier/retailer overhead. Where Syncio models a marketplace of separate businesses, this one assumes you own both stores, which is less to configure for the common case.

What the review record says

Read from the public App Store listing on 18 September 2026: 151 reviews, 4.6 average — and 13.9% of them rating three stars or below, the second-highest complaint share in the category behind SyncLogic’s 18.3%. Worth knowing how it got there: a 16 July crawl put this app at 177 reviews and an 11.3% complaint share; Shopify’s mid-2026 review enforcement cut it to 127 by late August — 28% gone — and its complaint rate went up, because it lost proportionally more positive reviews than negative ones. It has since recovered to 151, and the complaint share has stayed where the sweep left it. Averages in this category cluster so tightly that the complaint share is the number that actually separates the apps.

What the low-star reports describe, in the reviewers’ own recurring words rather than ours:

• Quantities changing unexpectedly — stock levels moving without a corresponding change on the other store, discovered after overselling.
• The worst reports, from late 2025, describe inventory being reset across a store and product images changing without being asked — the kind of incident that costs real money and real weekends.
• Support that answers, but not at the speed the incident deserved.

One structural thing is worth knowing alongside the reviews: sync apps in general fail silently. A dashboard can say “synced” while counts diverge, which is why the complaint reports in this category so often start with “we didn’t notice until…”.

None of this means the app fails for most stores. It visibly doesn’t — most reviews are positive. It means the failure mode, when it lands, is the expensive kind, and you should choose your sync app with that specific risk in mind.

The alternatives, by the job you actually have

The full comparison table with every app’s review record lives on the Syncio page; here is the short version by situation.

One ceiling to check before anything else: the top plan on the App Store listing stops at 5,000 products per connected store. Above that the developer’s own site lists a Rhodium plan at $99.99 a month (as of 25 September 2026), still counted per connected store — so a large catalogue across several stores is the most expensive shape this app can be given.

If you are switching: do it in this order

1. Ask what happens on disconnect — in writing. This is the single most expensive unknown when leaving any sync app, and the guide collects what merchants reported when it went wrong: some remove products they created or reset quantities when a connection is broken. Get the vendor’s answer before you touch anything.
2. Export products from every store first. Not as a ritual — the export is how you find duplicate and blank SKUs, which decide how well any successor app will match.
3. Run the new app in preview against the real catalogue, alongside the old one. Compare what the new app would write with what the old app believes is true. Disagreements between them are exactly the drift you were switching to escape.
4. Move one destination store, watch it for a week, then move the rest.

Where StockUnison sits, with the caveat

StockUnison is deliberately narrower than Multi-Store Sync Power: one-way inventory quantities only, from one main store you nominate into any number of destinations. It will not copy products or collections, and it will not sync two ways — if you need those, it is the wrong choice and the table above has better ones.

The narrowness buys the thing this page is about: ambiguous SKU matches are refused instead of guessed, every connection starts in preview mode so you see each write before it happens, every write is logged including the skips, and nothing is ever deleted. The free plan runs matching, preview mode and difference checks against your entire catalogue — it never writes to a destination, which means you can verify it against real data for as long as you like before trusting it with anything. Pricing is flat, per live connected store, and only the main store pays.

The caveat: StockUnison launched in August 2026 and has no review record yet. Multi-Store Sync Power’s record — including its complaints — is at least a record you can read. If you cannot afford to extend trust to a new tool, the honest move is to run StockUnison’s free plan in parallel purely to check for differences in your existing sync, and let it earn the rest.

Listing figures and complaint shares read from the public App Store listing on 18 September 2026 (prices re-checked on 25 September 2026, the Rhodium plan from egnition.io), calculated from the listing's own rating breakdown. Category-wide observations draw on a 16 July 2026 crawl of 2,603 public reviews; Shopify's mid-2026 review enforcement has since unpublished part of that corpus, unevenly across apps. These numbers move — the listing is linked so you can check today's.