Fitbit has everything I need, the steps, the Heart Rate, it has all of my exercising modes, and it has a fair price. It has a rather simplistic User interface, which I really like to be honest. Highly recommened!
Breathhh - Mental and physical exercise with scientifically proven effectiveness.
Strava - The #1 app for runners and cyclists
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Lose it! - Snap a photo of your food to get nutritional facts
Welltory - Manage your energy, not your time. Improve your focus & performance with small changes in your lifestyle. Quantified self dashboard for hardworkers.
SmartHealth - SmartHealth is a health and fitness app that effectively monitors and records your sleep patterns and various health-related parameters such as heart rate, blood pressure, etc.