If you’re anyone that dives into CSS on a regular basis you’ve had to fish for extra colors for use on gradients, hovers, border edges, and other HTML elements. For tonally consistent options I’ve relied on colllor in the past. Yet often I just want to slightly lighten or darker a specific hex color, but don’t want to open up Photoshop just to slightly adjust a HSL curve.
That’s exactly why 0 to 255 works so well. No more Photoshop or big third party tools. Just head here, enter a hex color, and you get a full spectrum of colors from light to dark.