The ultra-simple app for start-ups, small businesses and freelancers to send professional invoices and track expenses. Invoicing Create and email professional invoices to your customers. Record payments and see who owes you money. Expenses Record and categorize expenses while on the go. Products & Services Eliminate constant reentry by storing the products and services you invoice for the most. Make your business life easier with Sage One. This is a KNOX Enabled App.