Question 1

Is this tool free?

Accepted Answer

Yes. Calchemy tools are free to use in your browser.

Question 2

Is my data uploaded?

Accepted Answer

No. The tools are designed to run locally in your browser unless clearly stated otherwise.

Question 3

What do the four types mean?

Accepted Answer

Protanopia and deuteranopia are red-green color blindness types (reduced sensitivity to red or green respectively), tritanopia is blue-yellow color blindness, and achromatopsia is complete color blindness (seeing only in greyscale).

Question 4

How accurate is this simulation?

Accepted Answer

It uses standard approximation matrices commonly used for color-blindness previews. It's a useful guide for design decisions, not a clinical diagnostic tool.