Unit Plus is perhaps the most beautiful and simple unit conversion app in the App Store.

Very simple and beautifully designed unit converter with 24 categories and many different units:

CONVERT:
*Angle
*Area
*Shoe Size
*Energy
*Mass
*Length
*Speed
*Power
*Temperature
*Time
*Volume
*Acceleration
*Density
*Data
*Force
*Flow Rate
*Frequency
*Fuel
*Illuminance
*Pressure
*Torque
*Astronomical Units
*Blood Sugar
*Typography

This app's easy-to-use UI converts your measurements from one to all other units.
Just select your primary unit and see its value in all other units

Many more units coming soon.
Feel free to download the app and give your valuable feedback!