#51609D
Closest named color: Dusky Blue (#475F94). oklch(50.5% 0.099 272), rgb(81, 96, 157).
Aa
White text reads best on this color (5.98:1).
About this color
#51609D is a medium-dark, moderately saturated blue. In OKLCH its lightness is 50%, its chroma 0.099 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Dusky Blue (#475F94), ΔE 0.020 away. White text reads best on it, at 5.98:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.50:1 |
| White text | 5.98:1 |
Values
| HEX | #51609D |
| RGB | rgb(81, 96, 157) |
| HSL | hsl(228, 32%, 47%) |
| OKLCH | oklch(50.5% 0.099 272) |
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 #51609D | 5.98:1 | AA | Lc -85.0 | Fine for body text |
| Black text on #51609D | 3.50:1 | AA large text | Lc 24.3 | Dividers and decoration only |
| #51609D text on white | 5.98:1 | AA | Lc 79.8 | Fine for body text |
| #51609D text on black | 3.50:1 | AA large text | Lc -22.0 | 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 700.
-
Step 50
50
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E6E9F3
oklch(93.5% 0.014 272.7)
-
Step 200
200
#D3D9EB
oklch(88.6% 0.026 271.1)
-
Step 300
300
#B5BFE0
oklch(80.8% 0.048 272)
-
Step 400
400
#909ED1
oklch(70.7% 0.077 272.4)
-
Step 500
500
#7585C5
oklch(63% 0.098 272.6)
-
Step 600
600
#5E6EB1
oklch(55.5% 0.106 272.4)
-
Step 700
700 (this color)
#51609D
oklch(50.5% 0.099 272)
-
Step 800
800
#3F4B7C
oklch(42.6% 0.083 272.1)
-
Step 900
900
#363F64
oklch(37.7% 0.065 272.6)
-
Step 950
950
#1F253A
oklch(26.9% 0.04 271.3)
#51609D 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) | #49679F | 0.021 |
| Deuteranopia (no green cones) | #42609C | 0.019 |
| Tritanopia (no blue cones) | #346D77 | 0.088 |
| Achromatopsia (no color) | #636363 | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51609D
#51609D
oklch(50.5% 0.099 272)
- #79620D
#79620D
oklch(50.5% 0.099 91.8)
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 #51609D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.020
- French Blue #436BAD ΔE 0.037
- Denim Blue #3B5B92 ΔE 0.037
- Denim #3B638C ΔE 0.042
- Twilight #4E518B ΔE 0.047
- Muted Blue #3B719F ΔE 0.051
- Dusk #4E5481 ΔE 0.052
- Mid Blue #276AB3 ΔE 0.053
Use #51609D 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.