#51388B
Closest named color: Dark Slate Blue (#483D8B). oklch(41.4% 0.132 293.7), rgb(81, 56, 139).
Aa
White text reads best on this color (9.17:1).
About this color
#51388B 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 0.019 away. White text reads best on it, at 9.17:1.
| Hue family | Purples |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.132) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.28:1 |
| White text | 9.17:1 |
Values
| HEX | #51388B |
| RGB | rgb(81, 56, 139) |
| HSL | hsl(258, 43%, 38%) |
| OKLCH | oklch(41.4% 0.132 293.7) |
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 #51388B | 9.17:1 | AAA | Lc -95.2 | Preferred for body text |
| Black text on #51388B | 2.28:1 | Fails | Lc 13.1 | Not readable |
| #51388B text on white | 9.17:1 | AAA | Lc 90.8 | Preferred for body text |
| #51388B text on black | 2.28:1 | Fails | Lc -11.5 | 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
#F5F4FC
oklch(97% 0.011 292)
-
Step 100
100
#EAE7F8
oklch(93.5% 0.023 294.1)
-
Step 200
200
#DAD4F4
oklch(88.5% 0.044 294.1)
-
Step 300
300
#C2B8EE
oklch(80.9% 0.076 293.1)
-
Step 400
400
#A591E6
oklch(70.8% 0.123 293.8)
-
Step 500
500
#9073DF
oklch(63.2% 0.158 293.7)
-
Step 600
600
#7B59CC
oklch(55.6% 0.171 293.7)
-
Step 700
700
#6848B1
oklch(49.2% 0.16 293.7)
-
Step 800
800 (this color)
#51388B
oklch(41.4% 0.132 293.7)
-
Step 900
900
#453472
oklch(37.6% 0.103 293.5)
-
Step 950
950
#281F43
oklch(27% 0.065 293)
#51388B 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) | #04498E | 0.088 |
| Deuteranopia (no green cones) | #114689 | 0.083 |
| Tritanopia (no blue cones) | #424A5C | 0.105 |
| Achromatopsia (no color) | #484848 | 0.133 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51388B
#51388B
oklch(41.4% 0.132 293.7)
- #4C5000
#4C5000
oklch(41.4% 0.092 113.1)
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 #51388B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.019
- Blueberry #464196 ΔE 0.031
- Rebecca Purple #663399 ΔE 0.046
- Twilight #4E518B ΔE 0.066
- Cobalt #1E488F ΔE 0.075
- Dusk #4E5481 ΔE 0.080
- Chrysanthemum #560BAD ΔE 0.083
- Imperial Purple #480CA8 ΔE 0.085
Use #51388B 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.