See what a color is really made of.
Analyze color properties with advanced metrics including spectral composition, color purity, metamerism effects, and perceptual characteristics.
Choose a color
Pick a color, or type any code (HEX, rgb(), hsl() or a color name). Everything below updates instantly.
Scientific Analysis
Precise color measurements based on colorimetry and spectral analysis for technical applications.
Spectral composition (how much red, green and blue light)
Wavelengths are estimated from the CIE 1931 chromaticity of your color with a D65 white. Colors are made from three lights, so the real spectrum is not measured: this is the equivalent single wavelength.
Perceptual Properties
How colors appear to human vision, including purity, dominance, and perceived brightness.
Metamerism & viewing conditions
The same surface can look different under different lights. This estimate shows how your color may shift. Two colors that match in daylight can stop matching under another light; this effect is called metamerism.
This is an approximation that treats the color as a surface and applies each light’s tint. Real materials depend on their full reflectance spectrum.
Color Analysis
Analyze color properties with advanced metrics including spectral composition, color purity, metamerism effects, and perceptual characteristics. These tools provide deep insights into color behavior and appearance under different viewing conditions.
Scientific Analysis
Precise color measurements based on colorimetry and spectral analysis for technical applications.
Perceptual Properties
How colors appear to human vision, including purity, dominance, and perceived brightness.
How to use this tool (step by step)
Small steps, each with the reason behind it. Perfect for beginners, and a handy checklist for experts.
Choose a color
- Press the color square or type any code in the box at the top.
- The big swatch shows your color.
- All results below update at once.
Why we do this: The analysis is about one specific color, so every number depends on your choice.
Read the spectral composition
- Look at the three bars: red, green and blue.
- Longer bars mean more of that light.
- Then read the dominant wavelength: the single color of light that looks most like yours.
Why we do this: This shows what your color is really made of, and links it to the rainbow.
Check the perceived properties
- Read the perceived brightness and lightness.
- Check whether the color feels warm or cool.
- Read which text color (black or white) is easier to read on it.
Why we do this: The eye does not see all colors equally bright. Green looks much brighter than blue at the same strength.
Compare lights
- Look at the colored boxes under Metamerism.
- Each box shows how your color may look under a different kind of light.
- If the shifts are large, test your colors in the light where they will be used.
Why we do this: A color picked on a screen can look different in a shop, an office or at home.
Questions people ask
Quick answers.
What is the dominant wavelength?
It is the wavelength of the pure spectral light that, mixed with white, would match your color. Purples and magentas have no single wavelength, so we show the complementary wavelength instead.
What is color purity?
Also called excitation purity. 0% is a neutral gray or white and 100% is a fully pure spectral color. Most screen colors fall between.
Why is perceived brightness different from lightness?
Different formulas weigh the red, green and blue channels differently. We show the common ones so you can choose the one that matches your work.
What is metamerism?
Two colors that look the same under one light but different under another. Printers and designers check colors under several lights for this reason.