#51377B
Closest named color: Dark Slate Blue (#483D8B). oklch(40.1% 0.112 298.9), rgb(81, 55, 123).
Aa
White text reads best on this color (9.62:1).
About this color
#51377B is a dark, moderately saturated purple. In OKLCH its lightness is 40%, its chroma 0.112 and its hue 299°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.032 away. White text reads best on it, at 9.62:1.
| Hue family | Purples |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.112) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.18:1 |
| White text | 9.62:1 |
Values
| HEX | #51377B |
| RGB | rgb(81, 55, 123) |
| HSL | hsl(263, 38%, 35%) |
| OKLCH | oklch(40.1% 0.112 298.9) |
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 #51377B | 9.62:1 | AAA | Lc -96.3 | Preferred for body text |
| Black text on #51377B | 2.18:1 | Fails | Lc 11.9 | Not readable |
| #51377B text on white | 9.62:1 | AAA | Lc 92.1 | Preferred for body text |
| #51377B text on black | 2.18:1 | Fails | Lc -10.4 | Not readable |
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 900.
-
Step 50
50
#F6F4FC
oklch(97.1% 0.011 297.6)
-
Step 100
100
#ECE7F8
oklch(93.7% 0.023 299.4)
-
Step 200
200
#DDD3F4
oklch(88.5% 0.046 299.3)
-
Step 300
300
#C8B5F0
oklch(80.9% 0.084 299.3)
-
Step 400
400
#AC8CE8
oklch(70.6% 0.135 298.9)
-
Step 500
500
#996DE1
oklch(63.1% 0.171 298.9)
-
Step 600
600
#8451CF
oklch(55.5% 0.187 298.8)
-
Step 700
700
#7041B3
oklch(49.1% 0.173 298.8)
-
Step 800
800
#5B3691
oklch(42.6% 0.144 298.9)
-
Step 900
900 (this color)
#51377B
oklch(40.1% 0.112 298.9)
-
Step 950
950
#2C1D44
oklch(27.1% 0.071 299.4)
#51377B 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) | #1D457D | 0.077 |
| Deuteranopia (no green cones) | #244479 | 0.072 |
| Tritanopia (no blue cones) | #484453 | 0.087 |
| Achromatopsia (no color) | #454545 | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51377B
#51377B
oklch(40.1% 0.112 298.9)
- #434E00
#434E00
oklch(40% 0.094 118.6)
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 #51377B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.032
- Blueberry #464196 ΔE 0.051
- Rebecca Purple #663399 ΔE 0.063
- Twilight #4E518B ΔE 0.070
- Dusk #4E5481 ΔE 0.079
- Cobalt #1E488F ΔE 0.081
- Twilight Blue #0A437A ΔE 0.089
- Dusk Blue #26538D ΔE 0.090
Use #51377B 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.