Both give contrast ratios and identify when a combination will or won’t work in different situations; large text, UI components, etc…
The later has sliders so you can play around with different combinations.
Hope that helps.
The Wandering Shop is a Mastodon instance initially geared for the science fiction and fantasy community but open to anyone. We want our 'local' timeline to have the feel of a coffee shop at a good convention: tables full of friendly conversation on a wide variety of topics. We welcome everyone who wants to participate, so long as you're willing to abide by our code of conduct.