7 Best Alternatives to Square for Payment Processing in 2026

Why look beyond Square

Square is widely recognized for its integrated ecosystem that simplifies payment processing and business operations, particularly for small to medium-sized businesses. Its offerings span hardware for in-person transactions, a point-of-sale (POS) system, and APIs for online commerce and custom integrations. However, businesses might seek alternatives for several reasons.

One common driver is the need for more granular control over transaction fees or a different pricing structure, especially as transaction volumes grow. Some alternatives offer volume-based discounts or different models better suited for high-value or high-frequency transactions. Another factor can be the desire for deeper developer customization and integration capabilities beyond Square's RESTful APIs, which might be particularly relevant for complex e-commerce platforms or marketplaces. Businesses operating internationally may also find that Square's global reach and localized payment methods are not as extensive as some competitors. Finally, firms with highly specific industry requirements, such as subscription billing, complex fraud prevention, or niche hardware integrations, might find more specialized solutions elsewhere.

Top alternatives ranked

1. 1. Stripe — A developer-focused platform for internet commerce

   Stripe provides a suite of APIs and tools for online payment processing and financial services. Unlike Square's emphasis on integrated POS systems for brick-and-mortar stores, Stripe focuses on e-commerce, offering extensive customization options for developers. It supports a broad range of payment methods, including credit cards, digital wallets, and local payment options across over 135 currencies. Stripe's platform includes tools for subscription management, invoicing, fraud prevention (Radar), and even banking-as-a-service through Stripe Treasury. Its comprehensive documentation and SDKs for multiple programming languages facilitate deep integration into custom applications. Stripe is often preferred by businesses requiring fine-grained control over their payment flow, complex subscription models, or global market reach.

   Best for: E-commerce businesses, SaaS companies, platforms and marketplaces, businesses requiring extensive API customization and global payment options.

   • Learn more about Stripe
   • Stripe official documentation

2. 2. PayPal Zettle — Mobile POS for small businesses, integrated with PayPal

   PayPal Zettle, formerly iZettle, offers mobile point-of-sale solutions designed for small businesses, much like Square. It provides card readers for accepting in-person payments, a POS app for managing sales, and inventory tools. A key advantage of Zettle is its integration with the broader PayPal ecosystem, allowing businesses to manage both online and in-person transactions through a unified account. Zettle supports various card types and offers options for invoicing and gift cards. While it shares Square's focus on ease of use for small businesses, its integration with PayPal can be a deciding factor for merchants already using PayPal for online sales or who wish to leverage PayPal's extensive customer base. Zettle's hardware is designed for portability and simplicity.

   Best for: Small businesses, mobile merchants, businesses already using PayPal for online transactions, those needing simple POS and card reader solutions.

   • Learn more about PayPal Zettle
   • PayPal Zettle official site

3. 3. Shopify Payments — Integrated payment processing for Shopify stores

   Shopify Payments is the native payment gateway for businesses using the Shopify e-commerce platform. It simplifies payment processing by eliminating transaction fees that Shopify typically charges when third-party gateways are used. Shopify Payments supports major credit cards, digital wallets, and local payment methods, offering a streamlined checkout experience directly within the Shopify storefront. Its primary benefit lies in its deep integration with the Shopify ecosystem, providing unified reporting, chargeback management, and customer data. While it is not a standalone payment processor like Square or Stripe, it is the default and often most cost-effective solution for merchants building their online presence on Shopify. Businesses committed to the Shopify platform will find this alternative highly compelling due to its seamless operation.

   Best for: Merchants operating on the Shopify e-commerce platform, businesses seeking a fully integrated payment solution within their online store.

   • Learn more about Shopify Payments
   • Shopify Payments information

4. 4. Firebase — Backend services with payment integration capabilities

   Firebase, a Google-owned platform, offers a suite of backend services for building web and mobile applications. While not a direct payment processor, Firebase enables developers to integrate payment gateways like Stripe or PayPal through its Cloud Functions, Firestore database, and authentication services. For example, developers can use Cloud Functions to securely interact with payment APIs on the server-side, store transaction data in Firestore, and manage user authentication. This approach provides flexibility for custom application logic and user experiences. Businesses looking for a comprehensive backend solution that includes user management, real-time databases, hosting, and analytics, and then integrates a payment gateway, might consider Firebase. It is particularly strong for mobile and web apps requiring scalable backend infrastructure.

   Best for: Developers building custom mobile/web applications, startups needing scalable backend services, businesses requiring flexible payment gateway integration within a larger app architecture.

   • Learn more about Firebase
   • Firebase documentation

5. 5. Flutter — Cross-platform UI toolkit enabling custom payment UIs

   Flutter is Google's UI toolkit for building natively compiled applications for mobile, web, and desktop from a single codebase. While Flutter itself does not process payments, it is a powerful tool for developing the front-end user interfaces for payment flows. Developers can create highly customized checkout experiences, integrate with various payment gateway SDKs (like Stripe's Flutter SDK or Braintree), and build visually rich interfaces for both in-person and online payment applications. This allows businesses to maintain strong brand consistency and user experience across platforms. For companies building custom applications that require a bespoke payment interface and cross-platform reach, Flutter provides the framework to develop the client-side of the payment experience, which then interacts with a chosen backend payment processor.

   Best for: Businesses building custom mobile/web applications with highly branded payment UIs, development teams seeking cross-platform consistency for their payment experiences.

   • Learn more about Flutter
   • Flutter documentation

6. 6. React Native — Cross-platform framework for payment app development

   React Native is an open-source framework for building mobile applications using JavaScript and React. Similar to Flutter, it's not a payment processor but a development tool that enables the creation of custom payment-related user interfaces and experiences. Developers can integrate React Native apps with various payment gateways through their respective SDKs or APIs, building custom checkout flows, subscription management interfaces, or point-of-sale applications. It allows businesses to leverage existing web development skills to create native mobile apps that handle payment interactions. React Native is particularly suitable for companies that need to maintain a consistent UI/UX across web and mobile platforms or those with an existing React development team looking to expand into mobile.

   Best for: Developers with React expertise building custom mobile apps, businesses needing cross-platform mobile payment interfaces, rapid prototyping of payment experiences.

   • Learn more about React Native
   • React Native getting started guide

7. 7. Expo — Streamlined React Native development for payment apps

   Expo is a framework and platform for universal React applications, built on top of React Native. It simplifies the development, deployment, and updating of React Native apps, making it easier for developers to create payment-enabled mobile applications. Expo provides a set of tools and services that abstract away much of the complexity of native development, such as managing native modules and build processes. This allows for faster development cycles and easier over-the-air updates for payment UIs. While Expo does not handle payment processing directly, it facilitates the integration of third-party payment SDKs within the React Native ecosystem. It's an excellent choice for teams looking for a simplified and accelerated approach to building cross-platform payment applications, especially for those who prioritize rapid iteration and deployment.

   Best for: React Native developers seeking faster development cycles, rapid prototyping of payment-related mobile apps, businesses prioritizing over-the-air updates for their payment interfaces.

   • Learn more about Expo
   • Expo documentation

Side-by-side

How to pick

Choosing an alternative to Square depends heavily on your specific business needs, technical capabilities, and growth trajectory. Consider these factors when making your decision:

• Business Model and Scale:
  • If your primary business is online sales, subscriptions, or a marketplace, Stripe is often the preferred choice due to its extensive APIs, global reach, and robust tools for complex payment flows and fraud prevention.
  • For small businesses or mobile merchants primarily focused on in-person sales with occasional online transactions, PayPal Zettle offers a similar ease of use to Square but with integration into the broader PayPal ecosystem.
  • If you are exclusively running an e-commerce store on the Shopify platform, Shopify Payments provides seamless integration and avoids additional transaction fees within that ecosystem.
• Developer Resources and Customization Needs:
  • If you have a dedicated development team and require deep customization of your payment experience, whether for a mobile app or a complex web platform, Stripe's APIs are designed for this.
  • For businesses building entirely custom mobile or web applications that need a full backend, Firebase can provide the necessary infrastructure, allowing you to integrate payment gateways on the server-side securely.
  • If your focus is on building highly branded, custom user interfaces for payment flows across multiple platforms (iOS, Android, web), Flutter or React Native are excellent UI toolkits. Expo further streamlines React Native development for faster iterations. These options require integrating with a separate payment processor.
• Pricing and Fees:
  • Carefully analyze the transaction fees, monthly costs, and hardware expenses of each alternative. Square, Stripe, and PayPal Zettle generally operate on transaction-based pricing, but rates can vary based on transaction type (in-person vs. online) and volume.
  • Shopify Payments offers tiered pricing linked to your Shopify plan.
  • Backend services like Firebase have free tiers and usage-based pricing, while UI toolkits like Flutter and React Native are open source and free to use, though you'll incur costs from your chosen payment gateway.
• International Operations:
  • If your business operates or plans to operate globally, evaluate the international payment methods, currency support, and localized banking capabilities of each alternative. Stripe typically offers broader international support than Square.
• Ecosystem Integration:
  • Consider how well the payment solution integrates with your existing business tools, such as accounting software, CRM, or inventory management systems. An integrated solution can reduce manual effort and improve data consistency.