Project Timer - Tracker

The app helps you track the time spent on each task and project, it also calculates for you the gains made on the projects you set as billable.
Features:
Start a tiler for a given task.
Give the task a description.
Assign a task to a project.
Set an estimated duration for the project.
Make the project billable.
Set a duration.
Set an hour rate.
Set a client to the project.
Display some Analytics:
Total time for a given range of date.
Total gains..
The projects on which you worked + percentage of each.