Features
Time tracking
Know where the hours go.
Start a timer on a task or log time by hand. Compare it with the estimate, and see each person's week at a glance.
Timer or by hand
One running timer per person. A timer left on overnight is capped, so nobody logs 14 hours by mistake.
Estimate vs actual
Each task shows its estimate next to the time logged on it.
Workload
A weekly heat map of planned hours and estimates against each person's working hours.