Brewseful is a handy coffee app for java drinkers that aims to help you craft the perfect cup every time. The iPhone app is essentially a fancy phone timer, although it has features that rival Apple's built-in stopwatch feature.
The app calculates the ratio of coffee grounds to water, and it will tell you the exact moment to star pouring, stir and stop pouring for the perfect cup. These events can be added even while a brew is happening, so that you can make adjustments as you go. Once you've developed the ultimate method for prepping a coffee, the app lets you save custom timers to that you can enjoy the beverage the same way over and over again.