The Heroku colors are Heroku Light Periwinkle, Heroku Dark Blue-Gray, we recommend using the Heroku color palette for personal projects and in the case of commercial use to visit the company website. The color codes: RGB, CYMK for print, and Hex for web HTML/CSS. Heroku Official Website
Download the Heroku color scheme palette image with the color hex codes as a single image. These are the suggested colors to be used for digital media.