#66719E
Closest named color: Dull Blue (#49759C). oklch(55.8% 0.071 273.3), rgb(102, 113, 158).
Aa
White text reads best on this color (4.75:1).
About this color
#66719E is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.071 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Dull Blue (#49759C), ΔE 0.037 away. White text reads best on it, at 4.75:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.071) |
| Temperature | cool |
| Nearest name | Dull Blue (#49759C) |
| Black text | 4.42:1 |
| White text | 4.75:1 |
Values
| HEX | #66719E |
| RGB | rgb(102, 113, 158) |
| HSL | hsl(228, 22%, 51%) |
| OKLCH | oklch(55.8% 0.071 273.3) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #66719E | 4.75:1 | AA | Lc -78.4 | Fine for body text |
| Black text on #66719E | 4.42:1 | AA large text | Lc 31.1 | Non-text elements, placeholder text |
| #66719E text on white | 4.75:1 | AA | Lc 73.0 | Content text, not long reading |
| #66719E text on black | 4.42:1 | AA large text | Lc -28.7 | Dividers and decoration only |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 600.
-
Step 50
50
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E8EAF0
oklch(93.7% 0.008 271.3)
-
Step 200
200
#D5D9E5
oklch(88.6% 0.017 271.2)
-
Step 300
300
#B9C0D6
oklch(80.9% 0.032 271.6)
-
Step 400
400
#969FC1
oklch(70.7% 0.051 273.4)
-
Step 500
500
#7C87B2
oklch(63.1% 0.066 273.3)
-
Step 600
600 (this color)
#66719E
oklch(55.8% 0.071 273.3)
-
Step 700
700
#545E87
oklch(49.1% 0.067 273.2)
-
Step 800
800
#454D6D
oklch(42.7% 0.054 273.1)
-
Step 900
900
#3A4059
oklch(37.7% 0.044 273.7)
-
Step 950
950
#222634
oklch(27.1% 0.027 272.1)
#66719E with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #6375A0 | 0.011 |
| Deuteranopia (no green cones) | #5E719D | 0.011 |
| Tritanopia (no blue cones) | #567A81 | 0.064 |
| Achromatopsia (no color) | #737373 | 0.071 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66719E
#66719E
oklch(55.8% 0.071 273.3)
- #827341
#827341
oklch(55.8% 0.071 93.2)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #66719E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Blue #49759C ΔE 0.037
- Stormy Blue #507B9C ΔE 0.038
- Metallic Blue #4F738E ΔE 0.042
- Cerulean #457B9D ΔE 0.046
- Grey Purple #826D8C ΔE 0.048
- Grey Blue #647D8E ΔE 0.049
- Flat Blue #3C73A8 ΔE 0.049
- Muted Blue #3B719F ΔE 0.050
Use #66719E in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.