What are some alternatives?
Toggl - Toggl is an online time tracking tool. It features 1-click time tracking and helps you see where your time goes. Free and paid versions are available.
Timing - Timing is the best way to keep track of the time you spend with your Mac.
ManicTime - Track your computer usage and use collected data to accurately tag time.
Klokki for Mac - Rule-based automatic time-tracking
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.
Time Doctor - Time Tracking and Time Management Software that is accurate and helps you to get a lot more done each day.