Square, Stripe, and Shopify Payments are frequently compared as if they compete for the same customer. They don't. Each serves a different buyer with fundamentally different problems. Using the wrong one costs money and creates friction that compounds over time.
Square is for businesses taking payments in person: retail shops, restaurants, food trucks, salons, market stalls. Stripe is for developers building payment flows into software products. Shopify Payments is Stripe's processing engine repackaged specifically for Shopify merchants who want to avoid Shopify's third-party processor surcharge. The overlap is smaller than most comparison articles suggest.
The Fee Structures
The transaction economics matter before features.
Square in-person: 2.6% + $0.10 per swipe or tap. Online via Square: 2.9% + $0.30. Manually keyed transactions: 3.5% + $0.15. These rates are flat with no volume discounts below enterprise tier.
Stripe online: 2.9% + $0.30 per card charge. In-person via Stripe Terminal: 2.7% + $0.05 per transaction. ACH bank debits: 0.8%, capped at $5.00.
Shopify Payments: 2.9% + $0.30 on Basic Shopify ($29/month), 2.6% + $0.30 on Shopify ($79/month), and 2.4% + $0.30 on Advanced ($299/month). Shopify waives the additional transaction fee (0.5-2%) that would otherwise apply when using a third-party processor on their platform.
| Square | Stripe | Shopify Payments | |
|---|---|---|---|
| In-person rate | 2.6% + $0.10 | 2.7% + $0.05 | Tied to Shopify plan |
| Online rate | 2.9% + $0.30 | 2.9% + $0.30 | 2.4-2.9% + $0.30 |
| Monthly fee | $0 (basic POS) | $0 | $29-299 (Shopify plan) |
| POS hardware | Terminal $299, Register $799 | Reader from $59 | POS Go approx $49 |
| Inventory | Yes, included | No | Yes, via Shopify |
| Payroll | $35/mo + $5/employee/mo | No | No |
| Developer API | Functional | Excellent | Limited |
Square: Built for Physical Commerce
Square's business is payment terminals and the POS software that runs on them. The free mobile app turns an iPhone or iPad into a register. The Square Terminal at $299 is a standalone countertop device with a built-in receipt printer. The Square Register at $799 is a dual-screen setup with a customer-facing display, common in coffee shops and boutique retail.
The integrated ecosystem is the real value. Square handles card processing, tracks inventory across multiple locations, runs payroll at $35/month base plus $5/employee/month, generates tax-ready financial reports, and powers a basic online store through Square Online. A retail shop or restaurant can run its entire payment and operations workflow through Square without integrating five separate tools.
The limitation is rate flexibility. At 2.6% + $0.10 per swipe, Square costs more than direct interchange-plus pricing available to high-volume merchants. A business processing $500,000/year in card payments pays roughly $13,000-14,000 in Square fees. At interchange-plus pricing (roughly 1.8-2.0% effective rate), the same volume might cost $9,000-10,000. That $4,000 gap is Square's convenience premium.
Square's developer API is functional but wasn't designed with developer experience as the primary goal. Building a custom checkout flow embedded in your own software requires more engineering effort than the equivalent Stripe implementation.
Stripe: The Developer Payment Layer
Stripe's design is the inverse of Square's. No bundled POS software. No inventory. No payroll. Just payment processing with a well-documented API that gives developers precise control over the payment experience.
Stripe's in-person hardware exists: card readers starting around $59, the Stripe Reader S700 at $249 for a more capable terminal. It works, but if in-person payments are your primary use case, Square's terminal lineup is more purpose-built and better integrated with retail workflows.
Where Stripe earns its reputation is programmability. Subscription billing with automatic retry and dunning logic. Custom checkout flows. Multi-party payments with automatic platform fee splits for marketplace applications. 3D Secure authentication and Strong Customer Authentication for European transactions. These work correctly in Stripe by default. Implementing them in other processors requires significant custom engineering.
Stripe also supports more global payment methods: iDEAL, SEPA Direct Debit, Alipay, WeChat Pay, Klarna, and dozens more through a single integration. If you're selling internationally, this breadth matters.
Stripe's Ecosystem Beyond Transactions
One advantage of Stripe that doesn't appear in basic fee comparisons is the product ecosystem built on top of the core payment API.
Stripe Billing handles subscription management: proration when customers upgrade or downgrade mid-cycle, automatic payment retries with smart retry schedules that reduce churn from failed payments, the ability to issue credits and coupons, and revenue recognition for accounting. These features would require custom development or additional third-party tools with most other payment processors.
Stripe Radar, included in standard pricing, provides machine learning-based fraud detection that evaluates every transaction against Stripe's network of businesses. For online merchants, fraud protection trained on data from millions of businesses reduces the manual work of building and maintaining custom fraud rules.
These features don't change the 2.9% + $0.30 rate, but they change the total cost picture when you account for what you'd otherwise need to build or buy separately.
Shopify Payments: The Captive Option
Shopify Payments makes sense in exactly one scenario: you're running a store on Shopify and want to avoid Shopify's third-party processor surcharge.
Shopify's fee structure creates the incentive. Use a third-party processor on Basic Shopify and Shopify charges an additional 2% per transaction on top of that processor's rates. Use Shopify Payments and that fee disappears. On Basic Shopify at $29/month, a merchant processing $50,000/month saves $1,000/month by using Shopify Payments instead of an external processor.
Shopify Payments runs on Stripe's infrastructure. For merchants at sufficient volume, this creates a calculation: at what point does it make sense to negotiate directly with Stripe and absorb Shopify's transaction fee? For most Shopify merchants processing under $100,000/month, Shopify Payments is the correct default. Above that threshold, rate negotiations become worthwhile.
Handling Disputes and Chargebacks
Payment disputes are inevitable at any transaction volume. How each platform handles chargebacks affects your operational burden and your win rate.
Square manages the dispute process within its dashboard. When a cardholder files a dispute, Square notifies you, provides a response deadline, and guides you through submitting evidence: receipts, delivery confirmations, communication records. Square's dispute resolution team submits evidence to the card network on your behalf. For in-person transactions, the physical card swipe or tap provides strong evidence the cardholder was present, which generally improves win rates.
Stripe's dispute process gives you more control and API access. Stripe's dashboard provides detailed chargeback analytics, tracks dispute timelines, and exposes the dispute workflow through its API so you can automate parts of evidence submission. For high-volume online merchants with chargeback rates above 0.5%, Stripe Radar's machine learning flagging helps prevent fraudulent transactions before they become disputes.
Both platforms charge a dispute fee (typically $15) when a chargeback is filed, regardless of outcome. This fee is standard across the payment processing industry. Shopify Payments handles disputes through Stripe's underlying infrastructure, so the process mirrors Stripe directly.
Win rates on disputes vary significantly by card network, transaction type, and evidence quality. No payment platform eliminates chargeback risk. They only make the management process more or less painful.
The Recommendation
Use Square if you're running a physical location and want one integrated system for payments, inventory, and payroll without requiring developer involvement. The $299 Terminal is well-designed, the ecosystem integrates, and the flat processing rates trade cost efficiency for operational simplicity.
Use Stripe if you're building software that collects payments, running an online business with subscription or marketplace requirements, or selling internationally where payment method breadth matters. The developer experience and API depth justify Stripe for any business where payment flow is core to the product.
Use Shopify Payments if you're on Shopify and your monthly volume doesn't yet justify rate negotiation. It removes Shopify's surcharge and setup is straightforward.
Before committing to any payment processor: our SaaS negotiation checklist covers how volume-based pricing conversations actually work with payment vendors.