#51648C
Closest named color: Dusky Blue (#475F94). oklch(50.5% 0.068 264.5), rgb(81, 100, 140).
Aa
White text reads best on this color (5.91:1).
About this color
#51648C is a medium-dark, muted blue. In OKLCH its lightness is 50%, its chroma 0.068 and its hue 265°. 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 5.91:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | muted (0.068) |
| Temperature | cool |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.55:1 |
| White text | 5.91:1 |
Values
| HEX | #51648C |
| RGB | rgb(81, 100, 140) |
| HSL | hsl(221, 27%, 43%) |
| OKLCH | oklch(50.5% 0.068 264.5) |
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 #51648C | 5.91:1 | AA | Lc -84.7 | Fine for body text |
| Black text on #51648C | 3.55:1 | AA large text | Lc 24.5 | Dividers and decoration only |
| #51648C text on white | 5.91:1 | AA | Lc 79.5 | Fine for body text |
| #51648C text on black | 3.55:1 | AA large text | Lc -22.3 | 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
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E7EAF0
oklch(93.6% 0.009 264.5)
-
Step 200
200
#D3D9E6
oklch(88.5% 0.019 266)
-
Step 300
300
#B6C1D7
oklch(80.9% 0.033 264.4)
-
Step 400
400
#90A1C2
oklch(70.7% 0.052 263.6)
-
Step 500
500
#7589B3
oklch(63% 0.068 264.8)
-
Step 600
600
#5E739F
oklch(55.7% 0.073 264.5)
-
Step 700
700 (this color)
#51648C
oklch(50.5% 0.068 264.5)
-
Step 800
800
#3F4F6E
oklch(42.8% 0.056 263.2)
-
Step 900
900
#364159
oklch(37.6% 0.044 265.3)
-
Step 950
950
#202634
oklch(26.9% 0.028 266.5)
#51648C 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) | #56678E | 0.012 |
| Deuteranopia (no green cones) | #50628B | 0.006 |
| Tritanopia (no blue cones) | #3D6C72 | 0.061 |
| Achromatopsia (no color) | #646464 | 0.068 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51648C
#51648C
oklch(50.5% 0.068 264.5)
- #776134
#776134
oklch(50.4% 0.069 83.9)
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 #51648C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.026
- Denim #3B638C ΔE 0.027
- Denim Blue #3B5B92 ΔE 0.043
- Slate #516572 ΔE 0.044
- Metallic Blue #4F738E ΔE 0.044
- Muted Blue #3B719F ΔE 0.045
- Dusty Grape #545775 ΔE 0.046
- Dusk #4E5481 ΔE 0.047
Use #51648C 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.