I've been helping to beta test the new iOS Numerous app and have really grown to love it. Yes, it's beautiful, but it also has just the right amount of openness and flexibility to make it truly useful, too.
What can you use it for? Anything you want or need to quantitatively track or measure: the number of times you've gone to the gym, how many days since you've watered the plants, your weight, the number of panic attacks you've had this week, and so on.
But you can also tap into "public" numbers, which are either automatically provided by Numerous (such as stock prices and weather) or have been created by other users as publicly available. That's right, you can share your data, with everyone or just those you invite. For example, perhaps you and a buddy want to each share the number of miles you've run this week. If you have an iPhone 5s, it's dead simple to track or share how many steps you've taken each day because Numerous supports the M7 coprocessor. It can also read from Location Services, so right now for example, it's telling me I am 607 feet above sea level and 1,841.4 miles from Cupertino.
But the best part, for us home automators, is that there is an API for updating any value. Your HA system can easily keep you up-to-date on whatever you'd like to track. Or, use the IFTTT channel to tie-in any of the many options that service supports. (For example, during beta testing, I kept track of my weekly tweet count, all automatically.)
Check it out, I think you'll dig it.