FitGem is described as 'A command-line utility for checking Fitbit data' and is an app in the OS & Utilities category. There are three alternatives to FitGem for a variety of platforms, including iPhone, Android, iPad, Kindle Fire and Online / Web-based. The best alternative is fitbit. It's not free, so if you're looking for a free alternative, you could try HeadUp Labs or Digifit.
Sync your Fitbit or Apple Watch to the HeadUp Labs app & see your personalised human dashboard come to life. We’ll rate your heart, mind, sleep, activity & weight to help you transform your health. We may even save your life.