Square

**Stripe** is a financial technology company that provides online payment processing software and APIs for businesses of all sizes. Founded in 2010 by Irish brothers Patrick and John Collison, it lets companies accept payments, manage subscriptions and billing, handle tax compliance, prevent fraud, and access treasury and banking tools. Headquartered in South San Francisco and Dublin, it remains privately held.

Squarespace, Inc. is an American software company that provides a hosted website building and hosting platform. It offers customizable templates, domain registration, e-commerce features and related tools (including optional AI-assisted site-building features).

Lemon Squeezy is a commerce platform for selling digital products and subscriptions, aimed primarily at software companies. It provides payment processing, subscription billing, licensing, tax/VAT handling and storefront/customer management.

QuickBooks is an accounting software product line developed and marketed by Intuit. It provides bookkeeping, invoicing, payroll, expense tracking and tax preparation tools for small and mid-sized businesses, available in cloud-hosted and desktop editions. The product integrates with banks and third-party financial services and is used by millions of businesses.

Cash App is a mobile peer-to-peer payments and financial services platform operated by Block, Inc. It lets users send and receive money, use a Cash Card debit card, buy and sell bitcoin and stocks, and manage deposits and basic banking features.