#51247B
Closest named color: Indigo (#4B0082). oklch(37.1% 0.141 303.9), rgb(81, 36, 123).
Aa
White text reads best on this color (11.12:1).
About this color
#51247B is a dark, vivid purple. In OKLCH its lightness is 37%, its chroma 0.141 and its hue 304°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Indigo (#4B0082), ΔE 0.050 away. White text reads best on it, at 11.12:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | vivid (0.141) |
| Temperature | in between |
| Nearest name | Indigo (#4B0082) |
| Black text | 1.88:1 |
| White text | 11.12:1 |
Values
| HEX | #51247B |
| RGB | rgb(81, 36, 123) |
| HSL | hsl(271, 55%, 31%) |
| OKLCH | oklch(37.1% 0.141 303.9) |
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 #51247B | 11.12:1 | AAA | Lc -99.0 | Preferred for body text |
| Black text on #51247B | 1.88:1 | Fails | Lc 8.8 | Not readable |
| #51247B text on white | 11.12:1 | AAA | Lc 95.1 | Preferred for body text |
| #51247B text on black | 1.88:1 | Fails | Lc -7.5 | 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 900.
-
Step 50
50
#F7F3FD
oklch(97% 0.014 304.1)
-
Step 100
100
#EEE5FB
oklch(93.5% 0.031 304.3)
-
Step 200
200
#E1D0FA
oklch(88.5% 0.06 303.6)
-
Step 300
300
#CFB0F9
oklch(81% 0.106 303.6)
-
Step 400
400
#B882F5
oklch(70.7% 0.169 304.1)
-
Step 500
500
#A75CF1
oklch(63.1% 0.217 304)
-
Step 600
600
#933AE0
oklch(55.6% 0.236 303.9)
-
Step 700
700
#7D2AC2
oklch(49.1% 0.219 303.8)
-
Step 800
800
#66269D
oklch(42.8% 0.181 304)
-
Step 900
900 (this color)
#51247B
oklch(37.1% 0.141 303.9)
-
Step 950
950
#301849
oklch(27% 0.089 303.6)
#51247B 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) | #003A7E | 0.109 |
| Deuteranopia (no green cones) | #013B79 | 0.110 |
| Tritanopia (no blue cones) | #49384C | 0.104 |
| Achromatopsia (no color) | #3B3B3B | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51247B
#51247B
oklch(37.1% 0.141 303.9)
- #364700
#364700
oklch(37% 0.091 123.7)
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 #51247B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Indigo #4B0082 ΔE 0.050
- Royal Purple #4B006E ΔE 0.058
- Dark Slate Blue #483D8B ΔE 0.062
- Rebecca Purple #663399 ΔE 0.072
- Blueberry #464196 ΔE 0.079
- Grape Purple #5D1451 ΔE 0.080
- Imperial Purple #480CA8 ΔE 0.083
- Chrysanthemum #560BAD ΔE 0.085
Use #51247B 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.