Privacy: your data stays here

This site has no accounts, cookies, analytics or server receiving data. Your test answers, calibration and the photos you load into the simulator stay on your device.

What stays saved in your browser

• Your screen calibration: three gamma values.
• The last 10 test sessions: date, thresholds, check trials and flicker.
• The boxes you ticked in the preparation.
• The language and theme you chose.
• A copy of the site’s pages, so you can use it offline.

Photos are not saved: they stay in memory while the page is open.

The profile link

The link you share contains only the type and severity, for example “deutan 60”. No other data.

Where the site is hosted

The site is hosted on Cloudflare Pages, which like any server logs the IP address of requests for technical and security reasons.

Delete everything

The button clears the calibration, sessions, ticked boxes, preferences and offline copy this site saved on this device.