Sage One is a private company that is based in the UK and established in 1981. Today, the company provides software products to businesses in more than 20 countries and has sold products to more than 6 million companies that are small to medium sized. Sage One specializes in the development of accounting software for businesses. Options include Sage One Invoicing, which is strictly an accounts receivable program and Sage One Standard, which includes the features found in Sage One Invoicing plus full-service accounting functionality. Programs can be purchased online at Sage.com and are immediately accessible at the time of purchase for customers convenience.