#51257E
Closest named color: Indigo (#4B0082). oklch(37.5% 0.144 302.6), rgb(81, 37, 126).
Aa
White text reads best on this color (10.96:1).
About this color
#51257E is a dark, vivid purple. In OKLCH its lightness is 37%, its chroma 0.144 and its hue 303°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Indigo (#4B0082), ΔE 0.051 away. White text reads best on it, at 10.96:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | vivid (0.144) |
| Temperature | in between |
| Nearest name | Indigo (#4B0082) |
| Black text | 1.91:1 |
| White text | 10.96:1 |
Values
| HEX | #51257E |
| RGB | rgb(81, 37, 126) |
| HSL | hsl(270, 55%, 32%) |
| OKLCH | oklch(37.5% 0.144 302.6) |
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 #51257E | 10.96:1 | AAA | Lc -98.7 | Preferred for body text |
| Black text on #51257E | 1.91:1 | Fails | Lc 9.1 | Not readable |
| #51257E text on white | 10.96:1 | AAA | Lc 94.8 | Preferred for body text |
| #51257E text on black | 1.91:1 | Fails | Lc -7.8 | 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
#F7F3FE
oklch(97% 0.015 302.6)
-
Step 100
100
#EEE5FC
oklch(93.6% 0.032 303.5)
-
Step 200
200
#E0D0FB
oklch(88.4% 0.061 302.1)
-
Step 300
300
#CEB0FA
oklch(80.9% 0.107 302.7)
-
Step 400
400
#B682F8
oklch(70.7% 0.173 302.6)
-
Step 500
500
#A55CF4
oklch(63% 0.22 302.6)
-
Step 600
600
#913AE3
oklch(55.6% 0.239 302.5)
-
Step 700
700
#7C29C5
oklch(49.1% 0.222 302.8)
-
Step 800
800
#6525A0
oklch(42.8% 0.185 302.7)
-
Step 900
900 (this color)
#51257E
oklch(37.5% 0.144 302.6)
-
Step 950
950
#30184A
oklch(27.1% 0.09 303)
#51257E 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) | #003C81 | 0.107 |
| Deuteranopia (no green cones) | #003C7C | 0.108 |
| Tritanopia (no blue cones) | #48394E | 0.105 |
| Achromatopsia (no color) | #3C3C3C | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51257E
#51257E
oklch(37.5% 0.144 302.6)
- #384800
#384800
oklch(37.4% 0.092 122.9)
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 #51257E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Indigo #4B0082 ΔE 0.051
- Dark Slate Blue #483D8B ΔE 0.058
- Royal Purple #4B006E ΔE 0.061
- Rebecca Purple #663399 ΔE 0.068
- Blueberry #464196 ΔE 0.074
- Imperial Purple #480CA8 ΔE 0.079
- Chrysanthemum #560BAD ΔE 0.081
- Grape Purple #5D1451 ΔE 0.085
Use #51257E 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.