Has anyone used Expensify and Salesforce for managing Expense Reporting?

I'm looking at Expensify and Concur at the moment for building integration of expense reporting into Salesforce. I like the idea that both apps provide tools for your mobile phone to take a picture of receipts and upload them.

Looks like Expensify has limited integration with Salesforce. Any chance that this can be customized in order to tie Expenses to an Account or another object?

Any recommendations would be helpful.