Invoice Simple gives you the ability to include a signature on any of your invoices. This signature will be fully viewable in the app, on the invoice PDF and in all printed copies. Here how to add a signature to your invoices.
In the edit screen for your invoice, scroll to the bottom and hit Signature
A window will pop up that will allow you to draw your signature with a stylus or your finger
Once you are satisfied with your signature, hit save. The signature will now appear on your invoice just below the invoice total.