Cone Check All tools

Charts, maps and screenshots

Choose a chart, transit map, heat map, or screenshot. The page can Daltonize hard-to-see differences, overlay simple patterns by hue family, and name the dominant color regions in words. Nothing is uploaded to a server.

Help which vision

Set My cones to start with your own mix.

This screenshot is hard to read

Paste a screenshot with Ctrl or Cmd+V, or choose a file. The recolor stays on this device.

Choose a picture to begin.

Dominant regions

Check a palette

Paste two or three hex colors. The page says which pairs collide, then offers an Okabe-Ito set that stays clear.

Region labels are approximate samples of the image, not a GIS or design audit. For everyday tools that only need two colors or a simple boost, see All tools.