One of my favorite apps is Bean, although I keep changing my mind on what I want to use it for. Right now, it's pretty much to track how many books I'm reading. In the past I've counted finished versus unfinished knitting projects, how many days a month I got stuck in traffic on I-95, how many times my daughter did the dishes, even how many butterflies I saw in the Memorial Garden. The whole purpose of this app is to count things. You can change the colors of the tiles and add short descriptions to count whatever strikes your fancy. Increasing the count is just a tap of a finger. Just be warned that if you reset the count to zero, the date also changes. It's usually easier to decrease the count by tapping with two fingers.
My only negative for this app is that I wish you could add more tiles, or have a 2nd version. Even though I don't have many items listed at the moment, I could easily load up two or three Beans with stuff to count!