#51599C
Closest named color: Dusky Blue (#475F94). oklch(48.9% 0.107 276.5), rgb(81, 89, 156).
Aa
White text reads best on this color (6.44:1).
About this color
#51599C is a medium-dark, moderately saturated blue. In OKLCH its lightness is 49%, its chroma 0.107 and its hue 277°. 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 6.44:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.25:1 |
| White text | 6.44:1 |
Values
| HEX | #51599C |
| RGB | rgb(81, 89, 156) |
| HSL | hsl(234, 32%, 46%) |
| OKLCH | oklch(48.9% 0.107 276.5) |
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 #51599C | 6.44:1 | AA | Lc -87.0 | Fine for body text |
| Black text on #51599C | 3.25:1 | AA large text | Lc 22.2 | Dividers and decoration only |
| #51599C text on white | 6.44:1 | AA | Lc 81.9 | Fine for body text |
| #51599C text on black | 3.25:1 | AA large text | Lc -20.0 | 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
#E7E9F4
oklch(93.6% 0.015 277.8)
-
Step 200
200
#D4D8ED
oklch(88.6% 0.029 277.2)
-
Step 300
300
#B7BEE3
oklch(80.8% 0.053 276.7)
-
Step 400
400
#939CD4
oklch(70.6% 0.083 277)
-
Step 500
500
#7983C9
oklch(63.1% 0.106 276.7)
-
Step 600
600
#626CB6
oklch(55.7% 0.115 276.2)
-
Step 700
700 (this color)
#51599C
oklch(48.9% 0.107 276.5)
-
Step 800
800
#43497F
oklch(42.6% 0.089 277.1)
-
Step 900
900
#383E66
oklch(37.8% 0.069 276.1)
-
Step 950
950
#21243C
oklch(27% 0.045 277.5)
#51599C 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) | #3F629F | 0.031 |
| Deuteranopia (no green cones) | #395C9A | 0.031 |
| Tritanopia (no blue cones) | #356773 | 0.094 |
| Achromatopsia (no color) | #5E5E5E | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51599C
#51599C
oklch(48.9% 0.107 276.5)
- #715F00
#715F00
oklch(48.9% 0.101 96.1)
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 #51599C, closest first.
No curated palette has a color within ΔE 0.04 of #51599C.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.026
- Twilight #4E518B ΔE 0.033
- Denim Blue #3B5B92 ΔE 0.034
- Dusk #4E5481 ΔE 0.044
- Denim #3B638C ΔE 0.050
- French Blue #436BAD ΔE 0.052
- Light Navy Blue #2E5A88 ΔE 0.056
- Dusk Blue #26538D ΔE 0.062
Use #51599C 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.