Invoice Ninja is a free, open-source solution for invoicing & billing customers. With Invoice Ninja, users can easily create and send professional invoices from any internet-enabled device. Clients can print invoices or download them as pdf files as well as pay online from within the system.
Xero is world-leading online accounting software built for small business. Log in anytime, anywhere on your Mac, PC, tablet or phone to get a real-time view of your cash flow. It’s accounting software that’s simple, smart and occasionally magical.
Create a customized address book sync for Xero in less than 5 minutes. Add conditions, actions, and map your billing fields. Either have all your clients & suppliers sync 2-way with Xero, or do it based on custom attributes in your marketing or CRM platform. With PieSync, it’s easy to set up a simple one-to-one integration or a workflow spanning across multiple apps in minutes - without any technical help.