Marketcircle has today announced that their Billings Touch application is now available on the App Store. The app is an iPhone client for their Mac application, also with the name Billings, that lets you track time that you've worked on projects, handle estimates and invoicing to clients.

The app is free from the store but if you want the WiFi-syncing with the desktop application, there is an in-app purchase with the cost of $15.