#51378A
Closest named color: Dark Slate Blue (#483D8B). oklch(41.2% 0.132 294.3), rgb(81, 55, 138).
Aa
White text reads best on this color (9.27:1).
About this color
#51378A is a dark, moderately saturated purple. In OKLCH its lightness is 41%, its chroma 0.132 and its hue 294°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.020 away. White text reads best on it, at 9.27:1.
| Hue family | Purples |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.132) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.26:1 |
| White text | 9.27:1 |
Values
| HEX | #51378A |
| RGB | rgb(81, 55, 138) |
| HSL | hsl(259, 43%, 38%) |
| OKLCH | oklch(41.2% 0.132 294.3) |
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 #51378A | 9.27:1 | AAA | Lc -95.4 | Preferred for body text |
| Black text on #51378A | 2.26:1 | Fails | Lc 12.9 | Not readable |
| #51378A text on white | 9.27:1 | AAA | Lc 91.1 | Preferred for body text |
| #51378A text on black | 2.26:1 | Fails | Lc -11.3 | 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
#F6F4FC
oklch(97.1% 0.011 297.6)
-
Step 100
100
#EAE7F8
oklch(93.5% 0.023 294.1)
-
Step 200
200
#DAD4F3
oklch(88.4% 0.043 294.4)
-
Step 300
300
#C3B7EE
oklch(80.8% 0.078 294.6)
-
Step 400
400
#A590E6
oklch(70.6% 0.125 294.2)
-
Step 500
500
#9173DE
oklch(63.2% 0.157 294.4)
-
Step 600
600
#7C58CC
oklch(55.6% 0.173 294.4)
-
Step 700
700
#6948B0
oklch(49.2% 0.159 294.5)
-
Step 800
800 (this color)
#51378A
oklch(41.2% 0.132 294.3)
-
Step 900
900
#463472
oklch(37.7% 0.103 294.3)
-
Step 950
950
#291F43
oklch(27.1% 0.065 294.4)
#51378A 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) | #02488D | 0.089 |
| Deuteranopia (no green cones) | #104688 | 0.084 |
| Tritanopia (no blue cones) | #42495B | 0.105 |
| Achromatopsia (no color) | #474747 | 0.133 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51378A
#51378A
oklch(41.2% 0.132 294.3)
- #4A5000
#4A5000
oklch(41.2% 0.093 114.6)
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 #51378A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.020
- Blueberry #464196 ΔE 0.034
- Rebecca Purple #663399 ΔE 0.046
- Twilight #4E518B ΔE 0.068
- Cobalt #1E488F ΔE 0.076
- Dusk #4E5481 ΔE 0.082
- Chrysanthemum #560BAD ΔE 0.083
- Imperial Purple #480CA8 ΔE 0.084
Use #51378A 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.