#666D94
Closest named color: Metallic Blue (#4F738E). oklch(54.4% 0.062 276.3), rgb(102, 109, 148).
Aa
White text reads best on this color (5.02:1).
About this color
#666D94 is a medium-dark, muted blue. In OKLCH its lightness is 54%, its chroma 0.062 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Metallic Blue (#4F738E), ΔE 0.036 away. White text reads best on it, at 5.02:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | muted (0.062) |
| Temperature | cool |
| Nearest name | Metallic Blue (#4F738E) |
| Black text | 4.18:1 |
| White text | 5.02:1 |
Values
| HEX | #666D94 |
| RGB | rgb(102, 109, 148) |
| HSL | hsl(231, 18%, 49%) |
| OKLCH | oklch(54.4% 0.062 276.3) |
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 #666D94 | 5.02:1 | AA | Lc -80.1 | Fine for body text |
| Black text on #666D94 | 4.18:1 | AA large text | Lc 29.4 | Dividers and decoration only |
| #666D94 text on white | 5.02:1 | AA | Lc 74.7 | Content text, not long reading |
| #666D94 text on black | 4.18:1 | AA large text | Lc -27.0 | 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
#F5F5F8
oklch(97.1% 0.004 286.3)
-
Step 100
100
#E8E9EF
oklch(93.5% 0.008 278.6)
-
Step 200
200
#D6D8E4
oklch(88.4% 0.017 278.5)
-
Step 300
300
#BBBFD3
oklch(80.8% 0.028 276.7)
-
Step 400
400
#999FBD
oklch(70.8% 0.044 276.3)
-
Step 500
500
#8087AC
oklch(63.1% 0.056 276.3)
-
Step 600
600 (this color)
#666D94
oklch(54.4% 0.062 276.3)
-
Step 700
700
#585E81
oklch(49.1% 0.057 276.6)
-
Step 800
800
#484D69
oklch(42.7% 0.047 276.4)
-
Step 900
900
#3C4055
oklch(37.7% 0.036 276.1)
-
Step 950
950
#232632
oklch(27.1% 0.023 273.8)
#666D94 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) | #617196 | 0.012 |
| Deuteranopia (no green cones) | #5E6D93 | 0.011 |
| Tritanopia (no blue cones) | #5A747B | 0.054 |
| Achromatopsia (no color) | #6F6F6F | 0.062 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #666D94
#666D94
oklch(54.4% 0.062 276.3)
- #7A7046
#7A7046
oklch(54.4% 0.061 96.4)
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 #666D94, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Metallic Blue #4F738E ΔE 0.036
- Dull Blue #49759C ΔE 0.039
- Grey Purple #826D8C ΔE 0.044
- Stormy Blue #507B9C ΔE 0.044
- Battleship Gray #6C757D ΔE 0.050
- Grey Blue #647D8E ΔE 0.051
- Dark Lavender #856798 ΔE 0.051
- Cerulean #457B9D ΔE 0.051
Use #666D94 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.