ProperInvoice is described as 'Helps Freelancers, Startups and Small Businesses create and send Invoices, Quotes, Expenses, Payments and more' and is a Invoicing software in the business & commerce category. There are more than 25 alternatives to ProperInvoice for a variety of platforms, including Web-based, iPhone, Mac, Windows and iPad apps. The best ProperInvoice alternative is Midday. It's not free, so if you're looking for a free alternative, you could try Invoice Ninja or InvoicePlane. Other great apps like ProperInvoice are Invoicera, Manta, Crater and Invoncify.