10 Best Checkout & Cart Tools in 2026

Paddle is a payments infrastructure for SaaS companies. Merchant of record handles sales tax globally. Subscription billing with dunning management. Checkout optimized for conversion. Analytics show revenue and churn metrics. Payments that handle the complexity so you can focus on your product.

Ecwid adds e-commerce to existing websites. Install on any site, get a store—sell products without rebuilding your web presence or learning new platforms. The widget approach preserves existing sites. Multiple sales channels are supported. The free tier works for small catalogs. Website owners wanting to add a store without platform migration choose Ecwid for e-commerce that works alongside existing sites.

Volusion provides e-commerce for small businesses. Online store platform with straightforward approach—commerce without complexity. The simplicity serves small businesses. The features are sufficient. The learning is gentle. Small businesses wanting straightforward e-commerce use Volusion for simple online stores.

PayKickstart is a subscription billing and shopping cart platform. Features dunning management, affiliate management, and advanced analytics.

SamCart is an e-commerce platform designed for creators and entrepreneurs. Sell digital products with high-converting checkout pages and order bumps.

Bold Commerce provides a suite of applications specifically designed for Shopify merchants to enhance their e-commerce operations and maximize revenue. With over a decade of experience and trusted by hundreds of thousands of merchants, Bold offers solutions for core e-commerce needs, including subscriptions, upsells, and custom pricing. Their flagship product, Bold Subscriptions, is engineered to help businesses sell more to every subscriber by maximizing revenue and lifetime value through various upsell and cross-sell touchpoints. It integrates seamlessly with other Bold apps like Bold Upsell, providing a comprehensive solution for managing recurring orders, incentivizing loyalty, and converting one-time buyers into long-term subscribers. Bold Commerce is a Shopify Plus Certified App Partner, ensuring high standards for quality and support for complex merchant needs.

Zen Cart is a free, open-source e-commerce shopping cart software designed to help individuals and businesses establish their online stores. It provides a comprehensive set of built-in functionalities for managing products, sales, customers, and payments without restrictions on product quantity, sales volumes, or administrative users. The platform is built with flexibility in mind, offering extensive customization options through free and commercial plugins for payments, shipping, image management, and more. It supports multi-language and multi-currency operations, various payment gateways like PayPal and Stripe, and multiple shipping options. Zen Cart is ideal for small to medium-sized businesses looking for an unrestricted and community-supported solution to sell products online, including those needing B2B capabilities, discount management, and mobile accessibility. Zen Cart aims to provide an alternative to commercial e-commerce platforms by offering a robust, stable, and continuously developed solution that avoids escalating fees as a business grows. It's suitable for users who prefer an open-source environment and can leverage community support and extensive documentation for implementation and ongoing management.