Billbooks is described as 'New cloud accounting app for sending instant invoices and estimates to your clients. Customize columns, Manage expenses, send auto payment reminders, Keyboard shortcuts and way too many productive features' and is an website in the business & commerce category. There are more than 50 alternatives to Billbooks, not only websites but also apps for a variety of platforms, including Windows, iPhone, iPad and Android apps. The best Billbooks alternative is SmoothLedger, which is both free and Open Source. Other great sites and apps similar to Billbooks are Intuit QuickBooks, FreshBooks, Invoicera and Harvest.