MacroPinch Ltd. has Cardiograph (iTunes Link) for the iPhone, iPod Touch, and iPad in the iTunes App Store for FREE (regularly $1.99) for a limited time.

Cardiograph is an application which measures your heart rate. You can save your results for future reference, keep track of multiple people with individual profiles, add notes and locations, and even print out your measurements for sharing or safe keeping.

Cardiograph uses your device’s built-in camera to take pictures of your fingertip and calculate your heart’s rhythm – the same approach used by professional medical equipment!