Projects are arranged as a tree along the left-hand side of the window. Each project and subproject can have its own color and hourly billing rate. You set your own hierarchy, so if you need to track billable hours for multiple clients, the top level of your project tree can contain those clients, and the second level would contain the projects you do for each client.

To log your work on a project, drag it from the tree, drop it on the calendar and resize it to show how long you've worked for. If you're just starting now and want to use Klok Pro as a stopwatch, you can drop the project onto the target area that says "Drop here to work on." This is a neat feature, but it confused me when I was just starting out with Klok Pro: I tried dropping a document file on it, thinking Klok Pro would launch Word and start logging time for that project. It doesn't work that way--the only thing you can drop on that target is a project from the tree. That area does come in handy once you start working, because you can collapse the Klok Pro interface and leave just the timer visible and on top of all other windows, showing who you're billing at the moment and for what.

Klok Pro keeps time tracking relatively simple, but offers features powerful enough for users juggling multiple projects for multiple clients, and who need to charge for time spent in meetings and not just in front of the computer.

Note: This download takes you to the vendor's website, where you can download the Adobe Air app.

--Erez Zukerman