Foods and Moods is an application that tracks what you eat and how you feel. It is aimed primarily towards people trying to track which foods may trigger their digestive problems. It does this by keeping two logs: a log of the foods you eat and a log of your moods. This provides you with a searchable history using keywords or "tags", so you may see for yourself if there is any relationship between the two. It doesn't attempt to do any medical or nutritional analysis.
iRelief is an app that provides a breath control training for the user to practice controlled training techniques, while providing bio-feedback on the user's training data. Using photoplethysmographic techniques and the iPhone's camera, iRelief is able to measure the heart rate and calculate Heart Rate Variability (HRV) just by placing the user's fingertip on the camera lens. The HRV is a measure taken by the beat-to-beat interval of the user's heartbeat, which based on existing research, increases as we inhale and decreases as we exhale.