#51669B
Closest named color: Dusky Blue (#475F94). oklch(51.7% 0.088 266.9), rgb(81, 102, 155).
Aa
White text reads best on this color (5.63:1).
About this color
#51669B is a medium-dark, moderately saturated blue. In OKLCH its lightness is 52%, its chroma 0.088 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Dusky Blue (#475F94), ΔE 0.026 away. White text reads best on it, at 5.63:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.72:1 |
| White text | 5.63:1 |
Values
| HEX | #51669B |
| RGB | rgb(81, 102, 155) |
| HSL | hsl(223, 31%, 46%) |
| OKLCH | oklch(51.7% 0.088 266.9) |
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 #51669B | 5.63:1 | AA | Lc -83.4 | Fine for body text |
| Black text on #51669B | 3.72:1 | AA large text | Lc 26.0 | Dividers and decoration only |
| #51669B text on white | 5.63:1 | AA | Lc 78.1 | Fine for body text |
| #51669B text on black | 3.72:1 | AA large text | Lc -23.7 | 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 700.
-
Step 50
50
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E6EAF2
oklch(93.6% 0.012 264.5)
-
Step 200
200
#D2D9E9
oklch(88.5% 0.023 266.9)
-
Step 300
300
#B4C0DD
oklch(80.8% 0.043 267.6)
-
Step 400
400
#8DA0CC
oklch(70.7% 0.068 266.5)
-
Step 500
500
#7288BF
oklch(63.2% 0.087 267.2)
-
Step 600
600
#5A71AB
oklch(55.6% 0.095 266.9)
-
Step 700
700 (this color)
#51669B
oklch(51.7% 0.088 266.9)
-
Step 800
800
#3D4D77
oklch(42.6% 0.073 267.4)
-
Step 900
900
#344160
oklch(37.8% 0.056 266.4)
-
Step 950
950
#1E2638
oklch(27% 0.036 265.6)
#51669B 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) | #526B9D | 0.014 |
| Deuteranopia (no green cones) | #4B649A | 0.010 |
| Tritanopia (no blue cones) | #347179 | 0.079 |
| Achromatopsia (no color) | #676767 | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51669B
#51669B
oklch(51.7% 0.088 266.9)
- #7E6424
#7E6424
oklch(51.6% 0.088 86.4)
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 #51669B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.026
- French Blue #436BAD ΔE 0.031
- Muted Blue #3B719F ΔE 0.036
- Denim #3B638C ΔE 0.038
- Flat Blue #3C73A8 ΔE 0.041
- Dull Blue #49759C ΔE 0.043
- Denim Blue #3B5B92 ΔE 0.046
- Metallic Blue #4F738E ΔE 0.048
Use #51669B 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.