Gray Harmonizer
https://brentswisher.github.io/gray-harmonizer/
I just finished up creating a little tool to help with a design task I find tedious. Being more of a developer than a designer, choosing color schemes can be a little challenging sometimes. One technique I’ve found really helpful is “harmonizing the grays”. Basically, once you have your colors, you filter the gray values with your primary or secondary color so they are “tinted” slightly. I’m not sure if she created it, but I first heard about it from Erica Schoonmaker.
What’s not great, is having to use Photoshop or some other design software to do it. So I made it a website! It was a perfect use case for React, and the test suite in create-react-app made it easy to make sure my color conversions were correct.