Color Blind Accessibility Checker
See which colors in your photo, chart, or design are hard to tell apart for color blind viewers.
What the Color Blindness Analyzer does
This checker looks at an image you upload, not your eyes, and tells you which colors in it are likely to blend together for someone with red-green or blue-yellow color vision deficiency. Upload a chart, a poster, a website screenshot, or a photo you plan to publish, and the tool checks contrast between the colors used and flags spots where a color blind viewer would lose information. It's built for designers, teachers, and marketers who want to know before they publish whether a graph's red and green bars, or a warning icon and its background, still read clearly once printed or posted. The result names the problem areas and suggests safer color swaps.
See a sample result
Input: A bar chart comparing quarterly sales, using bright red bars for 'below target' and green bars for 'above target', with a thin gray gridline background.
- Protanopia safety32%
- Deuteranopia safety28%
- Tritanopia safety81%
- Overall accessibility47%
What the colors do
The red and green bars sit right next to each other on the chart, and for a viewer with deuteranopia they would look like nearly the same muted brown. A viewer with red-green color blindness would see two bars of similar tone and lose the entire point of the comparison.
Protanopia: bars blend to a dull olive, difference barely visible. Deuteranopia: same issue, slightly worse contrast. Tritanopia: bars stay distinguishable, this type is not the problem here.
Suggested fix
Swap green for a blue or teal, which stays distinct from red across all three types, and add a pattern (dots for above target, stripes for below) so the chart doesn't rely on color alone.
How it works
- 1
Upload the image you want to check
Add a screenshot, chart, slide, or photo. Anything with meaningful color, like a legend, a status icon, or a comparison graph, is worth running through the tool.
- 2
The AI reasons through each type of color blindness
It reviews the colors in the image against how protanopia, deuteranopia, and tritanopia, the three main types of color blindness, shift hue perception, and looks for pairs that a typical viewer separates easily but those viewers may not.
- 3
Problem colors get flagged
Any pair of colors likely to lose contrast for one of those types is called out, along with which color blindness type is affected and why the combination fails.
- 4
You get swap suggestions
Instead of just a warning, the tool suggests alternative colors, patterns, or labels so the same information reads clearly no matter how someone sees color.
Use cases
Checking a chart before a report goes out
Sales decks and dashboards love red and green. Run the chart through the tool first so a colorblind stakeholder isn't the one who finds the problem in the meeting.
Reviewing a website or app screen
Status badges, form errors, and buttons often lean on color alone. Upload a screenshot to see which elements would confuse a color blind visitor and where a label or icon would help.
Preparing classroom materials
Diagrams, worksheets, and science charts get handed to entire classrooms, some of whom are color blind. A quick check catches confusing color-coding before it reaches students.
Reviewing print or presentation slides
Posters, infographics, and slide decks are hard to fix after they're printed or presented. Testing the file first avoids a costly reprint or an awkward mid-presentation question.
Tips for better results
- Upload the actual final version of the image, not a rough draft, since colors often shift during editing.
- If the tool flags a red-green pairing, try blue and orange instead, since that combination stays distinct for all three color blindness types.
- Add a second visual cue, like a pattern, icon, or text label, wherever color carries meaning, so the image works even if a color pair is unavoidable.
- Check screenshots at the size they'll actually be viewed at, since small color patches are harder to tell apart than large ones.
- Re-run the check after you make changes, since a fix for one pairing can sometimes create a new problem with a third color in the image.
Limitations
This tool checks how an image's colors would appear to someone with a color vision deficiency. It does not test your own eyes and isn't a medical diagnosis: if you want to know whether you personally are color blind, an eye doctor can run a proper clinical test such as the Ishihara plates. Results depend on the exact colors in the uploaded image and on screen or print calibration, so treat the recommendations as a design check, not a certification.
Frequently asked questions
Does this checker tell me if I'm color blind?
No. It analyzes the colors inside an image you upload and reports which ones would be hard to distinguish for someone with color blindness. For a personal diagnosis, see an eye doctor for a clinical test.
What types of color blindness does it check for?
It covers protanopia and deuteranopia, the two red-green types, along with tritanopia, the rarer blue-yellow type, and reports how your image holds up under each one.
What kind of images work best?
Charts, graphs, infographics, app or website screenshots, and any image where color carries meaning, like a status badge or a warning icon, give the most useful results.
Can it fix the image for me?
It doesn't edit the image or produce a simulated version of it. It tells you which colors are the problem and suggests safer alternatives or additional cues like patterns and labels that you can apply yourself.
Why do red and green keep showing up as a problem?
Red-green color blindness is the most common type, and red and green are two of the hardest hues for those viewers to separate, so that pairing gets flagged more than any other.
Will the results match every color blind person exactly?
Color blindness varies in severity from person to person, so the result is a strong guide, not a guarantee for every individual viewer.
Plans start at $9 a month. See pricing