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!
Fitloop - Bodyweight fitness workouts for everyone
Strava - The #1 app for runners and cyclists
Fitbod - Personalized Strength-Training powered by Machine Learning
Lose it! - Snap a photo of your food to get nutritional facts
Hevy - Simple workout logging, insightful analytics, and a growing community of gym athletes.
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.