iHud is an minimalistic speedometer for the the iPhone.
iHud is not like every other speedometer app, its showing the speed on the actual windscreen. Just place the iPhone in front of the driver seat just below the windscreen, as the car drives, the app reacts and start writing the speed on the windscreen. The app is showing everything reversed, but when put underneath the windscreen, it is mirrored and thereby reversed to its be shown correctly. By default the app is using kilometers per hour, but should you prefer to view the speed in miles per hour, simply tap the km/h sign, and it will change to mph, along with the scale.
The app makes for an easier and safer way of viewing the speed, without actually removing the eyes from the road.
Disclaimer:
iHud and its developer cannot be held responsible for speeding, speeding tickets, or any other way of hazardous driving. The iHud app should always be used in regards to the speedometer of the driven car. Neither can the developer be held responsible for damages done to the users device, I do though recommend everyone to use a rubbery deck, case or another surface between the device, and the car dashboard, in order for the phone to stay securely in place.