There’s an iOS app called “Color Blind Pal” which does many things, but most usefully tells you the name of the colour under a cross hair overlaid on the camera

There’s an iOS app called “Color Blind Pal” which does many things, but most usefully tells you the name of the colour under a cross hair overlaid on the camera, which I find helpful as I struggle to name colours e.g. bright green vs yellow, or blue vs purple