Calculate resistor color codes with this handy reference app. The app is useful for the maker, engineer, student and arduino or raspberry pi tinkerer when working with electronics.

Supports 4 and 5-band resistors!

The industry standard color-code is used to identify the resistance value of resistors used in all kinds of electronics.

What’s New

Version 1.2

This app has been updated by Apple to use the latest Apple signing certificate.

Minor changes

Ratings and Reviews

3.9 out of 5
16 Ratings

16 Ratings

TheHammer610 ,

Great - But Needs Precision Option

Extremely helpful for standard resistors with four color bands. Would be nice to have a 5 band option.
I would pay if the app allowed the camera to ID the colors, if fast and reliable.

Lisianne ,

Wow, just perfect

Simple is as simple does, this app translates the resistor color codes to numeric form on one easy-to-use page; I love it.

Caution: you really need a reliable multimeter to verify that the resistor you have actually measures correctly, as it may have been overheated or otherwise incorrect.

MasudRanalive ,

Colour problem

Your green colour look so poor can you make it more brighter please

App Privacy

The developer, Vivid Planet Software, has not provided details about its privacy practices and handling of data to Apple.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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