InvoiceOcean is a simple and easy to use invoicing and accounting app. It allows you easily photograph documents and file them as expenses. You can also generate new invoices and send them as PDFs with just a few swipes. You can also track your income and expenses from InvoiceOcean's financial dashboard.
The app allows you to register, log in and pay for your account. Don't worry - the first 30 days are free!