Square vs Shopify POS for shops that also sell online

Part of our guide on contactless reader compatibility

The differences at a glance

Square and Shopify POS are tailored for businesses that sell both in-store and online. Square offers a lower-cost entry and works well offline, while Shopify integrates deeply with online stores and handles complex inventory.

Choosing between them depends on your business size, online presence, and need for offline sales capability.

Square POS additionally includes a variety of hardware options compatible with its system, such as stands, receipt printers, and barcode scanners, which are often less expensive than Shopify's equivalents. Shopify POS hardware tends to integrate more seamlessly with its platform but usually comes at a higher price point, which can influence initial setup decisions.

Square's simplicity suits businesses needing quick deployment without extensive customization, whereas Shopify POS appeals to retailers planning to scale with advanced customization and apps. For example, a small coffee shop might choose Square for its straightforward setup and offline capabilities, while a fashion boutique selling online and in multiple locations might benefit from Shopify’s advanced inventory features and online store integration. Before you commit to anything, it is worth looking at offline sales solutions.

Offline mode and reliability

Square POS supports offline transactions, storing sales locally and syncing when connectivity returns. This is crucial if your shop’s internet drops frequently or you run pop-ups without stable connection.

Shopify POS requires internet for most features. Its offline mode allows limited sales but risks lost data or errors without a reliable connection.

If your business cannot tolerate downtime during internet outages, Square’s offline mode is the clear winner. We cover cost and control for ecommerce in its own article.

Square’s offline mode can process payments and print receipts without an internet connection, storing the transactions securely until syncing is possible. This functionality covers up to a few hundred transactions before data needs to sync, which is sufficient for many small shops and pop-up events.

In contrast, Shopify POS’s offline mode supports only basic payment types and limited features, risking transaction errors or lost sales if the internet drops for extended periods. This limitation can be critical during busy retail hours when connectivity is unstable.

A practical check for offline reliability is to simulate an internet outage during a slow sales period. Square maintains seamless operation, while Shopify’s offline mode might show warnings or disable certain payment options, signaling potential risks for businesses relying on continuous sales. There is more on square and clover comparison in a separate guide.

Inventory management and integration

Shopify POS shines with inventory syncing across online and physical stores, updating quantities instantly and supporting complex variants and bundles.

Square POS handles inventory but treats online and in-store as mostly separate, requiring manual syncing or third-party tools for unified management.

If your shop depends on seamless inventory control between online and offline channels, Shopify provides a stronger, more automated solution. The other half of this decision is uk square reader bulk purchase.

Shopify’s inventory system supports complex product variants such as size, color, and material, automatically syncing stock changes made online or in-store in near real-time. This reduces overselling risks and simplifies inventory audits across channels.

Square’s inventory management is more basic, with limited support for variants and no automatic sync between online and physical store inventories. Merchants often resort to manual updates or third-party apps to bridge this gap, which can introduce errors and delays.

For instance, a retailer selling a product with multiple variations on Shopify will see inventory adjust instantly when a sale occurs online or offline. In Square, the same retailer must manually adjust inventory or risk inconsistencies, which can lead to overselling or stockouts.

Pricing and setup costs

Square POS has lower upfront costs. It charges flat-rate payment processing fees with no monthly software fee for basic use, making it ideal for limited budgets or temporary setups.

Shopify POS ties into monthly plans that include your online store and POS features. This investment suits businesses growing online or needing more tools like marketing and shipping.

For tight budgets or pop-up shops, Square’s cost structure is more predictable and affordable. For scalable growth and online presence, Shopify’s fees can be justified.

Square’s payment processing fee stands at 2.6% + 10¢ per swipe, dip, or tap for in-person transactions, with no monthly POS software fees for the standard plan. This makes it ideal for businesses with low sales volume or seasonal fluctuations.

Shopify’s POS Pro plan costs $89/month per location plus standard payment fees starting at 2.7% per transaction, which can add up for small merchants but includes advanced features like detailed reports and staff permissions.

A shop processing $2,000 monthly sales with Square pays roughly $52 in card fees and no monthly software fees, while the same shop using Shopify Pro pays around $54 in card fees plus $89 for the software, totaling $143. This difference emphasizes Shopify’s suitability for shops prioritizing features over cost.

User experience and support

Square POS features a simple, intuitive interface suitable for small teams or less tech-savvy users. Setup is quick and requires little training.

Shopify POS offers richer tools but with a steeper learning curve. Its support spans both e-commerce and retail, which can be beneficial if you operate a full online store.

If ease of use and quick deployment are priorities, Square is preferable. If you want extensive features and are ready to train staff, Shopify offers more.

Square’s support includes 24/7 phone, email, and chat options, with a large knowledge base and active community forums. Its interface is designed for minimal training, often allowing new employees to start processing sales with under 15 minutes of instruction.

Shopify POS customer support is also available 24/7 and includes live chat and phone help. However, the richer feature set means staff often require more comprehensive training, which can take several hours to master all aspects, especially inventory and order management.

User experience also depends on device compatibility: Square POS apps are optimized for iOS and Android tablets and smartphones, with occasional updates smoothing the user journey. Shopify POS tends to perform best on iPads, which can influence hardware purchasing decisions.

Square vs Shopify POS for shops that also sell online

Your choice depends on what matters most: cost, offline reliability, or online integration. If you run a pop-up or small store needing offline sales and low cost, Square POS fits best.

If your business relies heavily on online presence and needs real-time inventory syncing across channels, Shopify POS justifies its higher cost and complexity.

Both systems support payments and receipts well, but your decision hinges on offline needs and how tightly your online and physical stores connect.

• Choose Square POS: if you need robust offline sales and lower upfront costs
• Choose Shopify POS: if your online store drives inventory and sales priorities
• Avoid Shopify for low connectivity environments
• Avoid Square for complex online-offline inventory sync needs

Questions people still ask

I've set up both Square and Shopify POS in real shops and found offline mode the biggest practical difference.