Good to know
Simple first.
This is a simple RGB-distance check, not a laboratory colour measurement.
Free · No sign-up · PrivateColour & Accessibility
Colour Difference Checker.
Compare two HEX colours and see how far apart their RGB values are.
1 Enter2 Adjust3 Use result
Input
Answer
104.6
Simple RGB distance
This is a simple RGB-distance check, not a laboratory colour measurement.
Private by design
Files stay with you.
The actual file processing happens in your browser. A small number of advanced tools may load a browser helper library, but OutMonkey does not upload your file to do the job.
How file handling works →Before you finish
A quick check makes a better result.
OutMonkey is built to be simple enough for someone doing this once and useful enough for someone who does it every day.
What this tool is for
Colour difference checker
Measure a simple distance between two colours. The aim is a useful result without making you learn a full piece of software first.
Good to know
Use the number, then use your eyes.
A passing contrast result is useful, but also look at the real text size, weight, background and surrounding colours. Readability is the goal, not just the score.
A checker tells you what it can measure; it does not replace a final human look. Use the result to make the next decision, not as a guarantee.
In plain English
You do not need to be an expert.
You do not need to be a designer to use these checks. If text feels faint or difficult to read, choose a clearer combination even when the numbers are technically acceptable.
Use contrast checks as a floor for readability, not the whole accessibility story.