What the wheel actually does
Every press draws three independent integers between 0 and 255, giving one of 16,777,216 possible sRGB colours with equal probability. That is genuinely uniform over the colour cube — which also means most results are mid-saturation and mid-lightness, because the cube has far more of those than pure primaries. Values come from the browser's own random generator; nothing is sent anywhere.
The random colour generator handles the same job in a slightly different way.
How the description is worked out
The colour is converted to HSL. Lightness becomes a band from very dark to very light, hue selects a family such as red, cyan or violet, and hues from 300° through to 90° are labelled warm while the rest read as cool or fresh. If saturation is very low, the description simply says neutral grey, since a hue name would be meaningless. See the RGB to HSL converter for the underlying maths.
When you need something similar but not identical, the colour picker is there.
Good uses for a random colour
Random colours are useful for placeholder avatars, chart series, tagging systems and breaking creative block. They are a poor way to choose a brand palette — for that, start from one hue and use the palette generator so the result is harmonious rather than accidental.
If you do use a random colour behind text, check the pair reaches 4.5:1 for AA or 7:1 for AAA before shipping it. Colours are drawn locally in your browser and nothing is uploaded or saved between visits.
Frequently asked questions
- How many colours can it produce?
- 16,777,216 — every combination of three 8-bit channels, each equally likely.
- Where does the description come from?
- The hex is converted to HSL, then labelled by lightness band, hue family and warm or cool temperature.
- Can I copy the result?
- Yes. Press Copy hex and the current colour code goes to your clipboard.
- Is the colour saved anywhere?
- No. Everything is generated in your browser and nothing is stored or transmitted.
- Are the random colours readable as text?
- Rarely by luck — uniform random sampling lands most results in the mid-lightness band, where neither white nor black text reaches 4.5:1. If you plan to put words on the colour, test the pair in the contrast checker before you commit to it.