Free online color blind test
A quick, private Ishihara-style screening you can take right in your browser. It runs on your device, gives an instant result, and never uploads anything.
Important: this is a screening tool, not a medical diagnosis. For a clinical assessment, see an eye-care professional.
What the test checks
Red-green deficiencies (deuteranomaly and protanomaly) are the most common. The plates are designed so numbers stand out - or disappear - depending on how you perceive color.
How to take it
Use a normal screen at normal brightness, in neutral light, with any night-shift or color filters turned off. Read each plate at a glance rather than straining, and take the test a couple of times - a consistent result is the most trustworthy one.
Frequently asked questions
- Is the color blind test free?
- Yes. The screening is completely free, with no account and no sign-up. It runs in your browser and works offline once you install Satura.
- Is my data private?
- Yes. The test runs entirely on your device. Nothing - no answers, no camera, no results - is uploaded to a server.
- Is this a medical diagnosis?
- No. It is a screening aid only. It can flag a likely red-green deficiency and a rough sense of severity, but for a clinical diagnosis you should see an eye-care professional.
- How do I get the most accurate result?
- Use a real screen at normal brightness in neutral light, and turn off night-shift, blue-light and dark-mode color filters. Answer plates at a natural glance, and take the test more than once to check the result is consistent.
- What types of color blindness does it screen for?
- It focuses on red-green deficiencies (deuteranomaly and protanomaly), which are by far the most common. Satura can also simulate protanopia, deuteranopia and tritanopia so you can see how each looks.