#51397D
Closest named color: Dark Slate Blue (#483D8B). oklch(40.6% 0.111 297.5), rgb(81, 57, 125).
Aa
White text reads best on this color (9.41:1).
About this color
#51397D is a dark, moderately saturated purple. In OKLCH its lightness is 41%, its chroma 0.111 and its hue 297°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.028 away. White text reads best on it, at 9.41:1.
| Hue family | Purples |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.111) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.23:1 |
| White text | 9.41:1 |
Values
| HEX | #51397D |
| RGB | rgb(81, 57, 125) |
| HSL | hsl(261, 37%, 36%) |
| OKLCH | oklch(40.6% 0.111 297.5) |
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 #51397D | 9.41:1 | AAA | Lc -95.8 | Preferred for body text |
| Black text on #51397D | 2.23:1 | Fails | Lc 12.4 | Not readable |
| #51397D text on white | 9.41:1 | AAA | Lc 91.5 | Preferred for body text |
| #51397D text on black | 2.23:1 | Fails | Lc -10.8 | 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 800.
-
Step 50
50
#F6F4FB
oklch(97.1% 0.009 299.2)
-
Step 100
100
#EBE7F5
oklch(93.5% 0.019 299.1)
-
Step 200
200
#DBD5EF
oklch(88.6% 0.036 296.2)
-
Step 300
300
#C5B8E6
oklch(80.9% 0.065 297.9)
-
Step 400
400
#A892DA
oklch(70.7% 0.106 297.7)
-
Step 500
500
#9376CF
oklch(63.1% 0.133 297.5)
-
Step 600
600
#7E5DBC
oklch(55.6% 0.145 297.5)
-
Step 700
700
#6B4CA2
oklch(49.1% 0.135 297.9)
-
Step 800
800 (this color)
#51397D
oklch(40.6% 0.111 297.5)
-
Step 900
900
#473669
oklch(37.6% 0.086 297.5)
-
Step 950
950
#2A203E
oklch(27.1% 0.055 298)
#51397D 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) | #1F467F | 0.074 |
| Deuteranopia (no green cones) | #25457B | 0.069 |
| Tritanopia (no blue cones) | #474655 | 0.087 |
| Achromatopsia (no color) | #464646 | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51397D
#51397D
oklch(40.6% 0.111 297.5)
- #464F00
#464F00
oklch(40.5% 0.093 117)
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 #51397D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.028
- Blueberry #464196 ΔE 0.047
- Rebecca Purple #663399 ΔE 0.061
- Twilight #4E518B ΔE 0.065
- Dusk #4E5481 ΔE 0.074
- Cobalt #1E488F ΔE 0.078
- Dusk Blue #26538D ΔE 0.086
- Twilight Blue #0A437A ΔE 0.087
Use #51397D 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.