#66759D
Closest named color: Stormy Blue (#507B9C). oklch(56.6% 0.065 268.4), rgb(102, 117, 157).
Aa
Black text reads best on this color (4.59:1).
About this color
#66759D is a medium-dark, muted blue. In OKLCH its lightness is 57%, its chroma 0.065 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Stormy Blue (#507B9C), ΔE 0.031 away. Black text reads best on it, at 4.59:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | muted (0.065) |
| Temperature | cool |
| Nearest name | Stormy Blue (#507B9C) |
| Black text | 4.59:1 |
| White text | 4.56:1 |
Values
| HEX | #66759D |
| RGB | rgb(102, 117, 157) |
| HSL | hsl(224, 22%, 51%) |
| OKLCH | oklch(56.6% 0.065 268.4) |
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 #66759D | 4.56:1 | AA | Lc -77.2 | Fine for body text |
| Black text on #66759D | 4.59:1 | AA | Lc 32.4 | Non-text elements, placeholder text |
| #66759D text on white | 4.56:1 | AA | Lc 71.7 | Content text, not long reading |
| #66759D text on black | 4.59:1 | AA | Lc -30.0 | 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
#E7EAF0
oklch(93.6% 0.009 264.5)
-
Step 200
200
#D4D9E4
oklch(88.5% 0.016 266.3)
-
Step 300
300
#B9C0D4
oklch(80.9% 0.029 270.3)
-
Step 400
400
#94A0BF
oklch(70.7% 0.047 268.5)
-
Step 500
500
#7A89AE
oklch(63.2% 0.059 267.5)
-
Step 600
600 (this color)
#66759D
oklch(56.6% 0.065 268.4)
-
Step 700
700
#526083
oklch(49.2% 0.059 267.4)
-
Step 800
800
#434E6B
oklch(42.7% 0.05 268.2)
-
Step 900
900
#394157
oklch(37.7% 0.039 269)
-
Step 950
950
#212633
oklch(27% 0.025 268.3)
#66759D 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) | #68789F | 0.009 |
| Deuteranopia (no green cones) | #63739C | 0.007 |
| Tritanopia (no blue cones) | #567D83 | 0.058 |
| Achromatopsia (no color) | #767676 | 0.065 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66759D
#66759D
oklch(56.6% 0.065 268.4)
- #867449
#867449
oklch(56.5% 0.064 87.6)
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 #66759D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Stormy Blue #507B9C ΔE 0.031
- Dull Blue #49759C ΔE 0.036
- Grey Blue #647D8E ΔE 0.038
- Metallic Blue #4F738E ΔE 0.040
- Cerulean #457B9D ΔE 0.040
- Off Blue #5684AE ΔE 0.045
- Slate Gray #708090 ΔE 0.046
- Grey Purple #826D8C ΔE 0.048
Use #66759D 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.