Square vs. Shopify POS for Retail: Fees, Hardware, and Inventory

On this page 8 sections

1. Square vs. Shopify POS for Retail: The Core Difference
2. Processing Rates In-Store and Online
3. Shopify POS Fees and Square for Retail Fees: Monthly Plans and Add-Ons
4. Shopify POS Hardware vs. Square Hardware: Options and Upfront Costs
5. Inventory and Variant Management Compared
6. Selling Online and In-Store From One Catalog
7. When a Third Option Saves You Money
8. Next Steps for Choosing Your Retail POS

Key takeaways

• Both platforms bundle software, hardware and flat-rate processing, so compare your total monthly cost, not just the card rate.
• Shopify POS suits shops whose online store comes first. Square for Retail suits shops that start in-store and add online later.
• Each platform's card readers are built for its own processing, so hardware usually doesn't carry over if you switch.
• Once card volume grows, an interchange-plus account or a compliant cost program may lower costs. Run the numbers before deciding.

Choosing between Square vs. Shopify POS for retail comes down to four things: what you pay to process cards, what you pay for software, what the hardware costs, and how well each system tracks your inventory at the counter and on the website. This guide compares the two platforms on each point, shows you how to estimate your real monthly cost, and explains when a third option may make more sense for an independent shop.

One note before we start. Both companies change their rates, plan names and hardware prices regularly. We don't quote figures here. Instead, we show you where to look and which questions to ask. Confirm current terms on each provider's pricing page before you sign up.

Square vs. Shopify POS for Retail: The Core Difference

The two platforms started from opposite ends of retail.

• Square began as an in-person card reader and grew into a full POS. Square for Retail is its store-focused version. Online selling is available as an extension of the in-store system.
• Shopify began as an e-commerce platform and added Shopify POS so online merchants could sell in person. The POS connects to a Shopify online store, and the online store is the center of the account.

That origin shapes almost everything below. Inventory, reporting and pricing tend to be strongest on the side each platform started from.

Processing Rates In-Store and Online

Both platforms use flat-rate pricing on their standard plans. You pay a set percentage plus, in most cases, a per-transaction fee, whatever the card type. A basic debit card costs the same to accept as a premium rewards card.

The two structures differ in a few ways that matter for retailers:

• Square sets different rates for in-person, online and manually keyed transactions. Keyed entry usually costs the most. Watch this if you take phone orders or key in special orders.
• Shopify Payments sets rates by Shopify plan. Higher-tier plans generally get lower card rates in exchange for a higher subscription.
• Third-party processors on Shopify: Shopify has historically charged an extra transaction fee on online orders when a merchant uses an outside payment provider instead of Shopify Payments. Check whether that still applies to your plan.
• Custom pricing: Higher-volume merchants can sometimes negotiate rates with either provider. Ask before you assume the published rate is final.

Flat rates are easy to understand, but they aren't always the cheapest choice as volume grows. Our guide to interchange-plus vs. flat-rate pricing explains how the math changes as your sales increase.

Shopify POS Fees and Square for Retail Fees: Monthly Plans and Add-Ons

The card rate is only part of the bill. For a small shop, software subscriptions and add-ons can cost as much as processing.

Square for Retail Fees

Square offers a free retail tier with core POS functions and paid tiers that add retail-specific features. Paid features typically include advanced inventory tools, vendor management, purchase orders and deeper reporting. Paid plans are priced per location, so a second store increases the software bill. Separate add-ons, such as loyalty, marketing, payroll or team management, can add more.

Shopify POS Fees

To use Shopify POS, you need a Shopify subscription. Basic POS features come with Shopify plans. Advanced in-store features are sold as a paid add-on for each retail location. These include staff roles and permissions, deeper inventory counts, in-store analytics and omnichannel return tools. Apps from the Shopify App Store can also add monthly charges. Inventory, loyalty and reporting apps are the ones retailers most often add.

Build a Real Monthly Cost Worksheet

Use this worksheet with current figures from each provider:

Illustrative example: A shop that runs $30,000 a month in card sales would pay $900 a month in processing at a hypothetical 3% blended rate, before any software. Each tenth of a percentage point changes that figure by $30 a month, so a gap of half a point adds up to $150 a month, or $1,800 a year. These are made-up numbers, not either company's rates. They show why the card rate deserves as much scrutiny as the subscription.

Shopify POS Hardware vs. Square Hardware: Options and Upfront Costs

Both companies sell their own branded hardware. The lineups include:

• Portable card readers that pair with a phone or tablet. These suit pop-ups, markets and line-busting during the holiday rush.
• Countertop setups built around a tablet stand or all-in-one register, with a customer-facing display or card reader.
• Handheld smart devices that let staff check out customers or look up stock on the sales floor.
• Peripherals such as barcode scanners, receipt printers, cash drawers and label printers.

These hardware questions matter most for retailers:

1. Lock-in. Each platform's card readers are built to work with its own payment processing. If you switch providers later, expect to replace the readers.
2. Barcode workflow. Confirm the scanner and label printer you want are supported. This matters if you print your own SKU labels for consignment or handmade goods.
3. Upfront vs. financed. Both have offered payment plans on some hardware. Compare the total amount paid, not the monthly installment.
4. Replacement and support. Ask how fast a failed reader is replaced. A dead terminal on a busy Saturday in December costs real sales.

If you're open to hardware that isn't tied to one software company, browsing POS systems from several hardware brands can widen your options.

Inventory and Variant Management Compared

Inventory is where retail POS systems succeed or fail. A boutique with sizes and colors, a gift shop with hundreds of low-count items, and a hardware store with thousands of SKUs all need different things.

What to Test on Both Platforms

• Variants. How many size, color and material options can one product hold? Can you edit the whole grid at once?
• Stock counts by location. Can you see counts for the backroom, the sales floor and a second store separately?
• Transfers. Can you move stock between locations and track it in transit?
• Purchase orders and receiving. Can you create a PO to a vendor and receive it against the order by scanning?
• Cycle counts. Can staff count one section at a time without closing the store?
• Low-stock alerts and reorder points. These matter before peak seasons like back-to-school and the holidays.
• Bulk import and export. These are essential when you first load a catalog or switch systems.

In general, each platform's strongest inventory tools sit in its paid retail tier or POS add-on. The free or basic features may be enough for a small gift shop. A shop with deep variant grids should test the paid features during a trial.

Apparel shops face the toughest test. Our guide to size, color and style matrix inventory for boutiques covers what to check in detail.

Selling Online and In-Store From One Catalog

Finding the best POS for retail and online sales depends on keeping one source of truth for products, prices and stock.

Shopify's advantage is that the online store and POS share a single product catalog by design. Customers, orders and stock sync across channels without a separate connection. That helps with buy online, pick up in store, and with returning online orders at the counter.

Square's advantage is that the in-store system is the foundation, and Square Online draws from the same item library. For shops where most sales happen at the register, treating online selling as an extension can feel simpler.

Questions to settle before you commit:

• Can an online order be returned or exchanged in store, and does the refund go back to the original payment? See our guide on refunding to the original card, cash or store credit.
• Do gift cards work in both channels?
• Does a customer profile show both online and in-store purchases?
• If an item sells out in store, how quickly does the website update?

When a Third Option Saves You Money

Square and Shopify are popular because they're easy to start with. But all-in-one platforms bundle processing with software, and the bundle doesn't always fit a growing shop.

A separate merchant account may be worth comparing if:

• Your card volume has grown. On interchange-plus pricing, you pay the actual card network costs plus a disclosed markup. That can cost less than a flat rate once you process enough volume. Savings aren't guaranteed, so compare against your own statements.
• You want to offset card costs. Programs like dual pricing for retail stores, cash discount and surcharging (where permitted) shift some or all of the processing cost to customers who pay by card. Surcharging is governed by card network rules and state laws, including restrictions on debit cards. Read our explainer on cash discount, surcharge and dual pricing differences, and confirm the rules for your state with a qualified professional.
• You want hardware flexibility. Independent processors often support several terminal brands, such as Clover, Valor, Dejavoo and PAX, rather than one proprietary lineup.

MannyPay offers retail payment processing with POS systems and terminals from these brands, plus compliant cost programs that help eligible merchants offset most or all card-processing fees. For online sales, MannyPay lists Shopify integration among its supported platforms, along with WooCommerce, BigCommerce and others. Ask a specialist how that would work with your current store setup, because in-store and online options can differ.

Before switching any provider, check your current contract for termination terms. Our guide to avoiding merchant account early termination fees walks through what to look for.

Next Steps for Choosing Your Retail POS

1. Pull your last three months of statements and split card volume into in-person, online and keyed.
2. Fill in the cost worksheet above using each provider's current published pricing.
3. Trial the paid inventory features with your real catalog, especially your most complex variants.
4. Get at least one quote on interchange-plus or a cost program so you have a third number to compare.

For a broader look at features beyond these two platforms, see our small shop buyer's guide to retail POS systems. When you're ready to compare, request a free retail processing quote, and a MannyPay specialist will respond within one business day.

ME

About the author

MannyPay Editorial Team

Beyond the Swipe's editorial desk researches the publication's guides and news and cites its sources in every article. Articles reviewed by a named MannyPay editor carry that editor's byline.

This article is for general educational purposes and is not legal, tax or financial advice. Card network rules and state laws change; confirm current requirements for your business.