There are already a lot of online invoicing apps, with ever so many options that would best suit your needs. Like: create custom template, manage contact information, scan your invoices, easily create invoices, send invoices, send reminders, settle payments and so on.
Underneath are 23 Invoice Apps that are much loved. And used. By freelancers.
Tradeshift
Blink Sale
The Invoice Machine
Trade Invoice
Simple Invoices
Billing Boss
Jexxe Freelancer
Net 2 Invoice
Invoice Dude
Send Invoice
Billing Orchard
Simply Bill
Simply Invoices
Invoicera
Invoice More
Less Accounting
Invotrak
Invoice Journal
Fresh Books
Bill For
You forgot http://tradeshift.com and it’s completely free and much more than invoicing
I’ve been a freelancer for little over half a decade and have used some of the services listed above for the most crucial step in the freelancing process, GETTING PAID. While most of these app do their job right, I can say Curdbee is one of the kick ass tools available with an amazing free account without any restrictions on number of clients and invoices you can have.
don’t forget http://www.paymo.biz it’s not only an invoicing tool, but that’s actually a good thing these days isn’t it? Like a Swiss knife that gets more done.
Great list! AppAppeal made a top 35 online invoicing apps based on worldwide popularity http://www.appappeal.com/apps/invoicing/