Color Meter - RGB HSL CMYK RYB 4+

Measure color with your camera

Bjorn Folkstedt

    • 4.3 • 7 Ratings
    • Free
    • Offers In-App Purchases



Color Meter is an innovative new app that provides more accurate color measurements by utilizing a white reference to compensate for varying lighting conditions.

Color Meter is an innovative new app that provides more accurate color measurements by utilizing a white reference to compensate for varying lighting conditions, thereby enhancing precision.

Whether you are an artist, designer, decorator, photographer or just interested in colors, Color Meter is here to assist you.

The Power of the White Paper Reference
What sets Color Meter apart from other apps is its ingenious use of a white paper reference. By compensating for the color and intensity of the ambient light, Color Meter ensures that the color measurements are more precise and reliable. It is like having a professional meter in your pocket.

How to Use the App?
To use the app you need a white surface such as a white paper. Hold the white paper to the left of the color you would like measure. Direct the camera of your device so that the paper is filling up the left rectangle in the app and the color to be measured is filling up the right rectangle in the app.
To get correct results you need to make sure that the same light is falling on both the white paper and the color to be measured. Avoid any shadows on the paper and on the color measured. This is more important that usually expected. The app will automatically warn you for several problems - such as when a white surface is not present. When the warnings are gone, the app will automatically and continuously measure the color.

What color spaces are supported?
Color Meter currently supports RGB, RGB in Hex format, Hue/Saturation based color spaces HSL, HSI, HSB and HSP as well as CIE LAB, OK LAB, XYZ, YUV and the subtractive color models CMYK and RYB. Are you missing any color space? Let me know at and I try to add it. You can see them all at once or click on the ones you are most interested in for an enlarged view and graphical representation of them.

The app uses a kind of automatic live calibration where it constantly uses the white reference to compensate for any changes in the light.

How Accurate are the Measurements?
A number of issues makes it hard to measure colors exactly with a smartphone.
The largest errors will appear if the light falling on the paper and on the color you measure are not identical. This can happen if your device or your hand is shadowing the light or if the light got reflected on the hands or any other nearby objects that are not white. The effect of these lightning circumstances are much larger than one might expect.
Another important factor is the quality of the light. Preferably use natural daylight (such as from a window) when measuring. Any artificial light, such as the light from an LED, does not have a perfect color rendering index (CRI) and that will result in the app giving slightly different results using different artificial lights.
Generally low intensity light (ie when it is too dark) will also give less accurate measurements.
However, these problems are effectively eliminated when the app is used for comparison measurements. In other words, when the app is used in the same lightning conditions on the same smartphone device, two measurements on different colors can be compared with typically only small errors in the measurement.

Privacy Policy,
End User License Agreement,

This is a brand new app. Feel free to contact me with questions and improvement ideas. I try to answer all emails.

Download the Color Meter now and try it out for free!

What’s New

Version 1.5.0

• Expanded the CSV text file export of Saved Measurements to include all color spaces.
• Added the possibility to export PNG images of all saved colors.

Ratings and Reviews

4.3 out of 5
7 Ratings

7 Ratings

mckee1808 ,

A welcome addition to any lab

In combination with a light pad and camera holder, this app allows clean, simple and powerful data transfers for examining changes in transparent media. This set-up allows a more stable and orderly screening process for planned micro-algae growth and dye metabolism.

Shaft1358 ,

Powerful app for artists, painters and designers

This app automatically converts what the camera sees into several tinting code systems, avoiding recording numbers and using separate apps to convert from RGB to CYMK, etc.
Access to these codes facilitates color matching for calligraphers, makers, painters, interior designers, model builders and other artists.
The addition of a white reference compensates for the change in hues and shades due to lighting variances, and is often not available in similar apps.

App Privacy

The developer, Bjorn Folkstedt, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Purchases
  • Identifiers
  • Usage Data

Privacy practices may vary, for example, based on the features you use or your age. Learn More

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