About the Color Blindness Simulator
Roughly 1 in 12 men and 1 in 200 women have some form of color vision deficiency, which means a design that relies purely on color — a red/green status indicator, for instance — can be invisible or confusing to a meaningful share of any audience. This simulator applies scientifically modeled color transformations to a chosen color or an uploaded image so you can see approximately what someone with a given type of color blindness would see.
How it works
Choose a color vision deficiency type — protanopia, deuteranopia, tritanopia, or full achromatopsia are the most common categories — and the tool applies a matrix transformation to your input color or image that approximates how that condition alters perceived hue and saturation. These transformation matrices are based on published color science research and give a reasonable approximation, side by side with the original, so you can compare directly.
Common use cases
- Checking whether a red/green status system (like 'error' vs 'success') is distinguishable to color-blind users
- Auditing a chart or data visualization for color-blind accessibility before publishing
- Testing whether a logo still reads clearly under different color vision types
- Previewing an uploaded UI screenshot to catch color-only information encoding
- Educating a design team on why color alone shouldn't carry meaning in an interface
Tips for best results
Never rely on color alone to convey important information — pair color with an icon, label, or pattern so the meaning survives even under the most severe simulated condition. Deuteranopia (red-green) is the most common form by a wide margin, so if you can only check one condition, check that one first. Design teams that make a habit of checking new components this way, before shipping rather than after a complaint, tend to end up with far more robust color systems overall, since the fix is usually a five-minute change to add an icon or label rather than a full redesign.
Frequently asked questions
Protanopia and deuteranopia are both red-green color vision deficiencies, affecting the eye's red-sensing and green-sensing cones respectively, and together they account for the vast majority of color blindness cases. Tritanopia is a much rarer blue-yellow deficiency.
These simulations use well-established color transformation matrices from color science research and give a genuinely useful approximation, but they can't perfectly replicate an individual's actual visual experience, which varies in severity from person to person.
Yes — upload any image and the same transformation is applied across every pixel, letting you preview an entire UI mockup, chart, or photo under each simulated condition.
Achromatopsia is complete color blindness, where the person sees only in shades of gray. It's rare but included here as the extreme case, useful for checking that your design still works based on contrast and shape alone.
Not necessarily — the goal is usually to add redundant, non-color cues (icons, labels, patterns) to critical information rather than eliminating color from your design entirely. Use this tool to spot-check the specific elements where color alone currently carries meaning.