They currently offer three versions.
Here are some product descriptions to review it.
Simple Start version:
Create & manage invoices. Track sales & expenses. Apply sales tax.
All Simple Start features. In addition, users can: import data from QuickBooks, manage online banking, monitor your business, get industry stats/trends, create estimates, delayed&recurring billing.
All Essentials features. In addition, users can: track inventory, create purchase orders, track and bill time, prepare 1099s, create budgets.