Simple Invoices & Estimates is described as 'A simple, easy to use Invoices & Estimates program for Windows® Computers. It supports unlimited companies, adding on the fly items, customer list, items list, and easy to understand invoices report. Great for everyday businesses' and is a Invoicing software in the business & commerce category. There are more than 100 alternatives to Simple Invoices & Estimates for a variety of platforms, including Web-based, Windows, Mac, iPhone and Linux apps. The best Simple Invoices & Estimates alternative is GnuCash, which is both free and Open Source. Other great apps like Simple Invoices & Estimates are HomeBank, Odoo, ERPNext and Frappe Books.