There's nothing overly sexy about tracking your blood pressure, but for a large portion of society, it is a daily ritual. The Blood Pressure app by Codulis is a digital blood pressure diary that looks like it could have come from the guys over at tap tap tap.
The goal of the app is to "empower you to see the changes and reasons behind them using simple analysis". In the app, you can see the progression of your blood pressure over a single day to up to 6 months, as well as get simple statistics on the fly over the desired time period. Also included is the ability to tag measurements so you can identify what may have caused changes, such as stress levels, exercise, and diet changes.
The best part of the app though is how nice the interface works. Check out the promo video to see it in action.