Slate Blue vs Indigo

Slate Blue #6A5ACD View details →

Indigo #4B0082 View details →

What is the difference between Slate Blue and Indigo?

Comparing Slate Blue (#6A5ACD) and Indigo (#4B0082) reveals interesting optical contrasts. In terms of color intensity, Indigo features a more vivid and saturated tone. Under screen illumination, Slate Blue has a higher brightness and reflectivity. They have a close hue coordinate distance of 27°, representing a harmonized adjacent relationship.

Design recommendations for Slate Blue vs Indigo

When choosing between Slate Blue and Indigo for interface designs, consider their visual weight. Since Indigo is darker, it serves as a solid base for structural layouts or heavy typography, while the lighter Slate Blue is ideal for backgrounds or high-visibility accents. Testing their contrast ratio is essential to meet WCAG accessibility guidelines.

✦ Readability & Contrast Testing

Visual test showing black and white text overlay readability on both colors.

Slate Blue Typography

Preview of dark and light text elements rendered over a solid Slate Blue background canvas.

White Text: 5.31:1 Black Text: 3.96:1

Indigo Typography

Preview of dark and light text elements rendered over a solid Indigo background canvas.

White Text: 12.95:1 Black Text: 1.62:1

⚙ Technical Specifications Comparison

Format / Value	Slate Blue	Indigo	Delta / Difference
HEX Code	`#6A5ACD`	`#4B0082`	-
RGB Channels	`rgb(106, 90, 205)`	`rgb(75, 0, 130)`	`R:-31 \| G:-90 \| B:-75`
HSL Values	`hsl(248°, 53%, 58%)`	`hsl(275°, 100%, 25%)`	`H:+27° \| S:+47% \| L:-33%`
CMYK (Print)	`cmyk(48%, 56%, 0%, 20%)`	`cmyk(42%, 100%, 0%, 49%)`	-

◉ Individual Color References

Slate Blue Reference Sheet HEX, RGB, HSL and print codes

Indigo Reference Sheet HEX, RGB, HSL and print codes