One of the most annoying things in 3D printing is ordering filament, waiting for it to arrive, and then finding out that it’s completely the wrong color for the project you wanted it for. Some manufacturers try to get around this by putting Pantone colors on their spools, but certainly not everyone does this. (If they did, this app probably wouldn’t exist.)
Every filament manufacturer has pictures of their product online. It’s always super easy to compare and contrast different filament colors to make sure they’ll work for whatever you’re planning… as long as you’re buying everything from the same manufacturer. What do you do if you want to buy from two different places?
Get filaments from lots of different manufacturers, print with them, measure them, and photograph the results under similar conditions. We use spectrophotometry to show you the measured color of each plastic, then use that data (and color theory!) to automatically recommend other colors that will look good with it, regardless of manufacturer. If you know what the primary color of your project is going to be, let us suggest the other colors you should use!