Slim Timer or Less Time Spent?

Maybe this is an unfair comparison. Both are simple and free (for the time being) web-based timers built for those who want to bill hourly (or just keep track of project-based time). There are other online web apps that will track your time, but I find that most try and do too much—such as create invoices or clients/customer based projects.

UPDATE: Neither. I was fooled—please see the update of our time tracking application, Paymo.