LED Resistor Calculator is a free Android application developed by android-design.nl. It is a useful tool for determining the value of the current limiting series resistor when driving one or more series/parallel of LEDs. The app is designed to make LED circuit designing easier and more accessible for everyone.

The user interface of the app is simple and straightforward, making it easy to use for both beginners and professionals. The app allows users to select the LED type, supply voltage, and the number of LEDs in the circuit. After entering the required values, the app calculates the value of the current limiting series resistor. The app supports both series and parallel circuits, making it a versatile tool for LED circuit designing.