Ski Blackbox is described as 'Do you want to know everything about your day skiing or snowboarding? Check speed, slope angle, altitude, g-force, jumps and much more. You will see your line on a real map of the mountain'. There are four alternatives to Ski Blackbox for a variety of platforms, including iPhone, iPad, Android, Android Tablet and Apple Watch. The best alternative is Skied Demon. It's not free, so if you're looking for a free alternative, you could try AlpineReplay or Slopes.
Slopes is the best way to accurately track and show off days skiing and snowboarding with just your phone’s GPS. Slopes automatically detects lifts and runs, reporting statistics in real-time on the iPhone, Pebble watches, and now on Apple Watch.