Color blindness simulator
Preview colors for different vision types.
Approximate simulation (Viénot/Brettel matrices), computed in your browser. If two swatches look identical in a row, that pair may be hard to tell apart for that vision type.
How it works
Three simple steps — all in your browser.
Open it in your browser
Color blindness simulator runs entirely on your device — no upload, no account, and nothing to install.
Do the work
Preview colors for different vision types. Everything happens instantly as you go.
Save your result
Download or copy the output straight away. Your data never leaves your device.
Why use Color blindness simulator
Completely private
Color blindness simulator works locally in your browser — your files and text are never sent to a server.
Free, with no account
No sign-up, no trial, and no usage limits. Open the tool and start straight away.
Works on any device
Runs in any modern browser on desktop, tablet or phone — nothing to download.