Works great.

This is a great app. I use it in sync with the Billings Pro app for Mac to keep track of all my freelance hours for various clients.

If you need it to, it can generate invoices, estimates, and anything else like that.

Personally, I just use it to keep track of a lot of timers which ultimately get added into Harvest or sent out through Invoiceable, but I find this app indispensable.

maxfenton about Billings Pro - Time & Invoice