Inventory Software for Square POS Workflows

"Works with Square" covers very different connections. One vendor imports register sales and adjusts stock; another only records Square Terminal payments against its own invoices and describes no sales or stock sync at all. Before comparing features, decide where sales are rung up and which system must know the stock count when a register goes offline. The descriptions below come from each vendor's own documentation, checked on October 16, 2026; Inventory Software Guide has not connected a Square account to any of them.

Buyer constraint: an offline sale arrives after a transfer

A retailer sells the last unit while a register is offline. Operations, seeing stale availability, transfers that unit to another store. When the sale finally syncs, both locations acted correctly on different records. Which system notices, and who fixes the negative count, depends entirely on what the connection actually moves.

What each connection carries

inFlow offers two modes that can run together: paying orders created in inFlow on a paired Square Terminal, or ringing everything up in Square and letting inFlow pull completed orders in as fulfilled, paid sales orders that update sales and inventory levels. Orders containing items outside the Square catalog cannot be pulled and have to be recreated by hand. Product name, SKU, quantity on hand, price, and barcode go the other way, in what inFlow calls a one-way sync to Square, matched by SKU first and then by name; serial numbers are not sent, and blank prices or barcodes are not pushed. During setup, the Square account location is linked to one inFlow location. Refunds need the closest reading. A refund started on a Square Terminal under the pull mode becomes a new open sales order in inFlow, linked to the original by receipt number. inFlow also states that refunds processed directly in the Square Dashboard won't sync, so the related sales order must be updated by hand. inFlow is the clearer fit for a store that wants purchasing and receiving in one focused system and accepts that product edits made in Square will not flow back.

Cin7 states that Square sales flow in and update stock, which it describes as real time, that products added or edited in Cin7 push to Square, and that receiving stock in Cin7 pushes updated quantities back to Square. Its FAQ says multiple Square locations can be managed, without explaining how each one maps to a Cin7 location. It does not say which Cin7 edition the page covers and does not mention refunds. Cin7 fits a business where Square is one channel among wholesale, ecommerce, and warehouse operations, and where catalog ownership can sit firmly in the inventory system.

Zoho Inventory documents a payment connection, not a POS sync. From an invoice, staff can send the amount to a paired Square Terminal; alternatively, they enter the Square transaction details in Payments Received and apply that payment to the customer's invoice. Its help article does not describe importing Square register sales, syncing the catalog, or mapping Square locations. That suits a business that keeps its orders, invoices, and stock in Zoho and uses Square only as the card reader, provided every payment can be tied to a Zoho invoice. A retailer ringing up walk-in sales in Square POS should not shortlist Zoho Inventory on the strength of this connection.

Decision criteria for catalog and event ownership

Write down, for item, variant, barcode, price, location, sale, return, and transfer, which system is the source of truth and in which direction edits travel. When product details travel only toward Square, a price or name changed in Square never reaches the inventory system, and we infer it may be overwritten the next time that product is saved there; check that in the trial. Ask how long a pulled sale takes to adjust stock, how refunds made outside the documented path are caught, and whether a retried sync can create a duplicate.

Keep payment, sale, and stock movement distinct. A payment can be recorded without any stock leaving the shelf, and a sale can reduce stock before its refund is reconciled.

Reproducible mini-check

Create two variants at separate locations. Receive stock, transfer the last unit, record a Square sale while the register is offline, and restore it. Refund one sale on the Square Terminal and another in the Square Dashboard, then rename the item in Square. Check the stock count at both locations, which refund reached the inventory system, and which name appears in Square after the product is next edited in the inventory system. Inventory Software Guide has not run this check; buyers should run it on a trial account before migrating.

Conclusion: match the connection to where you ring up sales

Choose inFlow when Square is your register and you want a focused system that owns products and stock, and train staff to refund on the Terminal rather than the Dashboard. Choose Cin7 when Square is one sales channel inside a broader operation, but ask how refunds come back before signing. Consider Zoho Inventory only if Zoho holds your sales and stock and Square is just the card terminal for invoiced payments. If offline sales are frequent, test them before anything else: neither inFlow nor Cin7 documents how a delayed register sale is reconciled against a transfer made in the meantime.

If your POS already tracks stock, see is your accounting or POS inventory enough for the signs that you need more.