Great app, but it could use some tweaks. First, I can't figure out how to move different activities up and down, so I can reorder them. If this is not my mistake, you have to incorporate this in the next update. I could also use some kind of log window, which would inform me of the time I spend on each activity. Most of similar timers are meant for business customers, so Concentrate could become THE timer for creative work. I know it's not the basic function of this software, but joined with brilliant core idea it would really stand out.