I often get asked about the program I use for invoicing clients and I always give a rave recommendation for Pancake App. This powerful program is installed directly onto your domain and can be used for everything from invoicing to tracking project time to allowing clients to make easy payments.
It also provides each client with a “client area” that gives them a record of past projects and payments. Take a look at my sample client estimate to see an example! As you can see on my example, the invoices can be completely customized to match any branding with some basic css knowledge. Here’s a peek at the Dashboard (via Pancake App’s sample):
It has seriously made my life so much easier – Creating invoices is easy breezy now! And the cost of the app is just a one time payment versus a monthly fee. Check out all the details here and feel free to let me know if you have any questions! PS… I’m not an affiliate or salesperson, just a happy user :)