Square Invoices is described as 'Send professional invoices and estimates with no monthly fees, customizable templates, attachments, automated reminders, online payments, and instant tracking' and is a Invoicing software in the business & commerce category. There are more than 50 alternatives to Square Invoices for a variety of platforms, including Web-based, iPhone, Mac, Windows and iPad apps. The best Square Invoices alternative is Invoice Ninja, which is both free and Open Source. Other great apps like Square Invoices are Manager, Akaunting, InvoicePlane and SmoothLedger.