If you previously owned Billable, you can upgrade to ProfitTrain.
What's new in ProfitTrain 2.0 since Billable 1.2
There has been a lot of changes (both big and small) but to highlight some of the major items...
Multiple business support; toggle the active business from the toolbar!
Better syncing with Address Book.
Line Item Blueprints to help you create invoices of common services.
New ‘Estimate’ status for invoices.
Ability to translate invoice labels without editing the HTML template.
First class transaction history to record invoice payments.
Expense tracking, including the ability to invoice expenses.
Built-in reports and improved CSV exports.