Hey Landscape Poet,
We actually already have this capability in Jobber! Our free Expense Tracking add-on allows you to attach a receipt image directly to the expense item as documented proof of the expense. There's a brief mention of this in a product update blog post from when the feature was released in July: http://blog.getjobber.com/2013/07/up...ance/#expenses
The Jobber Blog
is a great place to stay tuned in general for product updates and new features. We literally add features and improve functionality every single week.
Freshbooks is an accounting/invoicing focused service suitable to pretty much any small business. They do a great job of managing invoicing and some of the basic back-end accounting. Jobber is focused on a more broad set of features that are important for field service businesses specifically, including the invoicing stuff that Freshbooks does, but also scheduling, time tracking, chemical records, and a lot more.
Hope that helps!
Sam @ Jobber