This colour vision checker lets you upload a photo and explore how it might look for people with different types of colour vision. It is a simple way to notice shifts in contrast and understand where your visuals might be harder to read.
Design is for everyone, and colour plays a big part in how people take in information. For some, reds and greens blend. For others, blues drop away. This tool helps you see those changes for yourself so you can make clearer, more intentional choices in your work.
While this is not a perfect representation of every person’s unique vision, it does follow respected research models and will give you a strong sense of how your colours are performing.
These colour vision transformations are based on the work of Gustavo M. Machado, Manuel M. Oliveira and Leandro A. F. Fernandes. Their study helps make these previews possible.
Open 'A Physiologically-based Model for Simulation of Color Vision Deficiency' research paper
Hi, I’m Shannon. I make websites and brands easier to use, nicer to look at, and a whole lot more accessible.
If your site or brand feels a bit clunky or confusing, I’m the woman to call.
I’ve spent more than ten years helping businesses use design to communicate clearly, work better, and include more people.
If that sounds like what you need, let’s chat.
Work with meIf this has helped you and you’d like to support future tools, you can leave a small donation. It helps me keep these resources free and continue building more accessibility helpers for designers, founders and teams.
Accessibility and great design go hand in hand. Together we can build something that looks good, works well, and helps your business connect with more people.
