#51388E
Closest named color: Dark Slate Blue (#483D8B). oklch(41.6% 0.136 292.9), rgb(81, 56, 142).
Aa
White text reads best on this color (9.10:1).
About this color
#51388E is a dark, moderately saturated purple. In OKLCH its lightness is 42%, its chroma 0.136 and its hue 293°. 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 9.10:1.
| Hue family | Purples |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.136) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.30:1 |
| White text | 9.10:1 |
Values
| HEX | #51388E |
| RGB | rgb(81, 56, 142) |
| HSL | hsl(257, 43%, 39%) |
| OKLCH | oklch(41.6% 0.136 292.9) |
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 #51388E | 9.10:1 | AAA | Lc -95.0 | Preferred for body text |
| Black text on #51388E | 2.30:1 | Fails | Lc 13.4 | Not readable |
| #51388E text on white | 9.10:1 | AAA | Lc 90.6 | Preferred for body text |
| #51388E text on black | 2.30:1 | Fails | Lc -11.7 | 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
#F5F4FC
oklch(97% 0.011 292)
-
Step 100
100
#EAE7F8
oklch(93.5% 0.023 294.1)
-
Step 200
200
#DAD4F5
oklch(88.5% 0.045 293.8)
-
Step 300
300
#C2B8F0
oklch(81% 0.079 292.7)
-
Step 400
400
#A490E9
oklch(70.7% 0.129 293.1)
-
Step 500
500
#8F72E2
oklch(63.1% 0.164 293)
-
Step 600
600
#7A58CF
oklch(55.6% 0.176 292.9)
-
Step 700
700
#6747B4
oklch(49.1% 0.165 292.8)
-
Step 800
800 (this color)
#51388E
oklch(41.6% 0.136 292.9)
-
Step 900
900
#453474
oklch(37.8% 0.106 292.9)
-
Step 950
950
#281F44
oklch(27% 0.067 292.5)
#51388E 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) | #004991 | 0.089 |
| Deuteranopia (no green cones) | #09478C | 0.086 |
| Tritanopia (no blue cones) | #404B5D | 0.110 |
| Achromatopsia (no color) | #484848 | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51388E
#51388E
oklch(41.6% 0.136 292.9)
- #4D5100
#4D5100
oklch(41.7% 0.093 113)
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 #51388E, 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 0.029
- Rebecca Purple #663399 ΔE 0.043
- Twilight #4E518B ΔE 0.066
- Cobalt #1E488F ΔE 0.075
- Chrysanthemum #560BAD ΔE 0.080
- Dusk #4E5481 ΔE 0.082
- Imperial Purple #480CA8 ΔE 0.082
Use #51388E 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.