The decision turns on one question: do online and in-person sell the same stock?
If they share a catalogue, Shopify POS
Because inventory is one number. A sale in the shop decrements the same stock the website sells from, instantly, with no sync job and no reconciliation.
Running Square alongside Shopify means two inventory systems and a connector keeping them approximately aligned. "Approximately" is the expensive word — overselling is a customer service problem that arrives at the worst moment, and reconciliation is somebody's weekly job forever.
| Shopify POS | Square | |
|---|---|---|
| Inventory with a Shopify store | One system | Two, synced |
| Hardware cost | Higher | Lower, good free tier |
| Standalone retail features | Good | Excellent |
| Appointments, invoicing, payroll | No | Yes |
| Staff permissions, multi-location | Strong on Pro | Strong |
| Best for | Retail attached to an online store | Retail-first businesses |
Where Square genuinely wins
Retail-first businesses. If the shop is the business and the website is secondary, Square's standalone retail tooling is better and cheaper.
Services alongside products. Appointments, invoicing and payroll in one system.
Starting cost. The free tier and cheaper hardware matter when you are opening.
The cost nobody budgets
Two systems means someone reconciles them. At a few hundred orders a month that is a weekly annoyance; at a few thousand it is a part-time job and an overselling incident every month or two.
The honest test: if you sell out of something in the shop on a Saturday, does the website know before Monday? If the answer involves a sync schedule, you have the cost.
Talk it through
Tell us whether the shop and the site sell the same stock.
That one answer usually decides it. We will tell you what the integration would involve if you want to keep both.
Ask usA real read within one business day — not a sales call.
About the author
Manpreet Singh
Founder of Proscube. Leads the studio's Shopify, headless and CRO engineering, and works directly with founders rather than through account managers.
More about Manpreet
