I was searching for an easy, inexpensive, professional and trusted online tool for sending invoice and collecting payments for my business and my wife's business. After finding several options, ZipBooks became the OBVIOUS choice, and I am extremely happy I chose it. It works exactly as they promise, offers even more than I thought, and if/when you have any question or issue, the Chat feature is right there - and they get back to you within a day!! Right now I'm at the point where I'm just using the FREE version, but if I need to upgrade they offer affordable options for that too. If you're looking for a way to send invoices to customers and give them the ability to pay online, ZipBooks is a GREAT tool.