#51377E
Closest named color: Dark Slate Blue (#483D8B). oklch(40.3% 0.116 297.9), rgb(81, 55, 126).
Aa
White text reads best on this color (9.55:1).
About this color
#51377E is a dark, moderately saturated purple. In OKLCH its lightness is 40%, its chroma 0.116 and its hue 298°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.029 away. White text reads best on it, at 9.55:1.
| Hue family | Purples |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.116) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.19:1 |
| White text | 9.55:1 |
Values
| HEX | #51377E |
| RGB | rgb(81, 55, 126) |
| HSL | hsl(262, 39%, 35%) |
| OKLCH | oklch(40.3% 0.116 297.9) |
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 #51377E | 9.55:1 | AAA | Lc -96.1 | Preferred for body text |
| Black text on #51377E | 2.19:1 | Fails | Lc 12.1 | Not readable |
| #51377E text on white | 9.55:1 | AAA | Lc 91.9 | Preferred for body text |
| #51377E text on black | 2.19:1 | Fails | Lc -10.5 | 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 800.
-
Step 50
50
#F6F4FB
oklch(97.1% 0.009 299.2)
-
Step 100
100
#EBE7F6
oklch(93.5% 0.021 298.2)
-
Step 200
200
#DCD4EF
oklch(88.5% 0.038 299.2)
-
Step 300
300
#C5B8E7
oklch(80.9% 0.067 297.6)
-
Step 400
400
#A992DC
oklch(70.8% 0.108 297.9)
-
Step 500
500
#9475D2
oklch(63.1% 0.139 297.7)
-
Step 600
600
#7F5BBF
oklch(55.5% 0.152 297.9)
-
Step 700
700
#6B4BA5
oklch(49.1% 0.14 297.4)
-
Step 800
800 (this color)
#51377E
oklch(40.3% 0.116 297.9)
-
Step 900
900
#48356B
oklch(37.7% 0.091 298.1)
-
Step 950
950
#2A203F
oklch(27.1% 0.057 297.3)
#51377E 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) | #194580 | 0.080 |
| Deuteranopia (no green cones) | #21447C | 0.074 |
| Tritanopia (no blue cones) | #474555 | 0.090 |
| Achromatopsia (no color) | #454545 | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51377E
#51377E
oklch(40.3% 0.116 297.9)
- #444F00
#444F00
oklch(40.4% 0.094 118.5)
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 #51377E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.029
- Blueberry #464196 ΔE 0.047
- Rebecca Purple #663399 ΔE 0.059
- Twilight #4E518B ΔE 0.069
- Dusk #4E5481 ΔE 0.079
- Cobalt #1E488F ΔE 0.080
- Twilight Blue #0A437A ΔE 0.089
- Dusk Blue #26538D ΔE 0.089
Use #51377E 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.