Speed n Miles - Best speedometer iPhone App to show speed and distance traveled. Use Speed n Miles app in car, boat, plane or while biking and running to keep track of your current, average and maximum speed. The app records and saves trip details that can be shared via email. HUD displays and projects speed on car's windshield in glowing characters. Easy to use beautifully designed user interface. Both metric and imperial units supported. The app is great for in-vehicle or sports tracking usage. The middle color changing ball shows driving pattern and meausres acceleration.