Google Fit vs Samsung S Health

Google Fit
An open platform that lets users control their fitness data. Google Fit lets developers build smarter apps and manufacturers focus on creating amazing devices. It's a service that'll track all your health metrics - sleep, steps, etc.
Samsung S Health
Samsung S Health leads you through consistent, daily fitness routines. Set goals and achieve them with the help of the Galaxy S5's pedometer and S Health’s, which constantly tracks your exercise, including your condition, how far you walk and how long for, the calories you burn, your speed, and so on.

Latest news about Google Fit and Samsung S Health:

06.01.17. Google Calendar integrates with Google Fit and Apple Health to help you stick to your fitness goals. Google announced an update to Goals (feature in Google Calendar) that allows you to connect Google Fit and Apple Health to the fitness goals you set in Goals. Once you hit your goal, your Google Calendar items will automatically be marked as “done.” When you look at your fitness goals in Google Calendar, Google will also show you how well you’ve done so far. The new feature makes sense given the ubiquity of fitness trackers and the fact that it doesn’t even take any special hardware (except for a compatible smartphone) to get started with services like Google Fit.

29.10.14. Google Fit app is available for Android devices. Google has released its Fit app, which acts as a central storehouse for activity recorded via your Android device, and via apps that use the Google Fit SDK. The dedicated Android app provides a way for users to see an overview of their collected health and fitness data in one central location. It uses your device’s sensors to tracking walking and other activity, and you can manually enter information about workouts not tracked, or your height and weight. Heart rate info from compatible devices, including Android Wear smartwatches, are also fed to the app. In short, it’s a competitor to Apple’s Health application, but with a very different approach to UI that appears to want to aim for simplicity above all else.

08.08.14. Google launches SDK for its health and fitness tracking service. Google Fit is a service for bringing health and fitness tracking to the Android ecosystem. It’s essentially Google’s version of Apple’s HealthKit service and will launch with the release of Android L later this year. Today Google announced the Preview SDK for Fit so that developers can now start building their own apps for the service before it becomes widely available. Currently, the SDK gives developers access to three different APIs. Developers will be able to use raw sensor data from connected apps and devices through the Sensor API. Using these APIs, a running app could register with a heart rate monitor, for example, to get its data every five seconds so it can display this info and give feedback to a runner.

2013. Samsung unveiled S Health app. Samsung unveiled new Galaxy S4 phone that has a built-in pedometer and an app called S Health. The phone has built-in sensors designed to measure the temperature and humidity of your location, which is then sent to the S Health app. The S Health app will also work with third party devices such as glucose meters and blood pressure monitors. In addition, Samsung mentioned the S Band bracelet, which appears to work much like a Nike Fuelband or Jawbone Up, but you can use it when you don't want to carry your phone with you. You then sync your data back to the phone when you're done with your run. There's also a body scale and a heart rate monitor which will send data to the phone via Bluetooth.