looking for a recommendation

[sarah_speaking]

I am looking for a online program/website (preferably user-friendly and free) where people can keep track of and log the time they spend doing a particular activity, and then an admin can look at all the participants' activities and compare. Preferably the participants could go back and look at their own progress but not necessarily edit it. Mostly the idea is to keep track of the time spent doing something.

Does anyone have any ideas, or could point me in the right direction? I'm not really sure how to search for something like this. Mostly I just think about programming it, but I'm not really that good at programming... :/