Adafruit has launched their Circuit Playground app for iPhone, iPad and iPod Touch. It provides a collection of reference formulas at the touch of a button, simplifiying calculations to make your project more fun.
Decipher resistor & capacitor codes with ease. Calculate power, resistance, current, and voltage with the Ohm’s Law & Power Calc modules. Quickly convert between decimal, hexadecimal, binary or even ASCII characters. Calculate values for multiple resistors or capacitors in series & parallel configurations. Store, search, and view PDF datasheets. Access exclusive sneak peaks, deals & discounts at Adafruit Industries. All that, plus updates with additional features & enhancements – MANY NEW CALCULATORS AND TOOLS being added!
The app costs $2.99 in the Apple appstore, and you receive a $2.99 coupon to use one your next Adafruit purchase. This is a really handy app to have if you have an iOS device. They promise an Android version is in the works.