RallyClock is an unobtrusive time tracking system. RallyClock is simply the most unobtrusive time tracking system available. It is easy to integrate RallyClock into your daily workflow using IM (Instant Messenger) and/or using the RallyClock API. We believe the simpler it is to log time, the more often people will log time. This leads to the most accurate time accounting - which means more money saved for you and your clients.