Resistor Color Code is an Android app developed by android-design.nl that allows you to calculate a resistor's value by simply selecting the band colors. It is a free app and falls under the Business & Productivity category. The app is equipped to support 3, 4, 5, and 6 band resistors. It is a very efficient and quick calculator with the ability to show the E-series number for standard E-series value resistors.

The app is also capable of working in reverse, allowing you to enter a resistor value and find the color code. If the value is not a standard E-series value, the app shows the two nearest values. This app is an excellent tool for engineers and technicians who need to work with resistors and need quick access to their values. The app also has a link to another app for resistor SMD code.

Overall, Resistor Color Code is an excellent app that delivers what it promises, and its speed and efficiency are unmatched.