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.

Essentials version:

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.

Plus version:

All Essentials features. In addition, users can: track inventory, create purchase orders, track and bill time, prepare 1099s, create budgets.

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