I bought four time tracking apps and this one made the cut.
It is easy to setup and get started tracking.
You can track by project, client, and task. I love the ability to duplicate prior entries to quickly enter recurring entries.
The sync with Dropbox is seamless and well worth the $0.99.
The format of the export is easy to put into a pivot table to allow for template invoicing with the ability to modify the output easily.
It has the ability to track on multiple devices and sync the information but I havent tried it.
I had a couple of questions and the developer was very responsive.
EarningsBarrage about TimeTracker - Time Tracking