#51318D
Closest named color: Dark Slate Blue (#483D8B). oklch(40.4% 0.145 295.1), rgb(81, 49, 141).
Aa
White text reads best on this color (9.66:1).
About this color
#51318D is a dark, vivid purple. In OKLCH its lightness is 40%, its chroma 0.145 and its hue 295°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.031 away. White text reads best on it, at 9.66:1.
| Hue family | Purples |
| Lightness | dark (40%) |
| Chroma | vivid (0.145) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.17:1 |
| White text | 9.66:1 |
Values
| HEX | #51318D |
| RGB | rgb(81, 49, 141) |
| HSL | hsl(261, 48%, 37%) |
| OKLCH | oklch(40.4% 0.145 295.1) |
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 #51318D | 9.66:1 | AAA | Lc -96.2 | Preferred for body text |
| Black text on #51318D | 2.17:1 | Fails | Lc 12.0 | Not readable |
| #51318D text on white | 9.66:1 | AAA | Lc 91.9 | Preferred for body text |
| #51318D text on black | 2.17:1 | Fails | Lc -10.5 | 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
#F6F4FD
oklch(97.1% 0.012 296.4)
-
Step 100
100
#EBE7F9
oklch(93.6% 0.024 296.1)
-
Step 200
200
#DBD4F6
oklch(88.6% 0.047 294.9)
-
Step 300
300
#C4B6F2
oklch(80.9% 0.085 295.1)
-
Step 400
400
#A78EEC
oklch(70.7% 0.136 294.9)
-
Step 500
500
#936FE5
oklch(63.1% 0.172 295.1)
-
Step 600
600
#7F53D3
oklch(55.6% 0.188 295.4)
-
Step 700
700
#6B43B7
oklch(49.1% 0.175 295)
-
Step 800
800 (this color)
#51318D
oklch(40.4% 0.145 295.1)
-
Step 900
900
#473176
oklch(37.6% 0.114 295.1)
-
Step 950
950
#2A1E45
oklch(27.1% 0.071 295.5)
#51318D 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) | #004590 | 0.095 |
| Deuteranopia (no green cones) | #00438B | 0.095 |
| Tritanopia (no blue cones) | #41465A | 0.114 |
| Achromatopsia (no color) | #454545 | 0.146 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51318D
#51318D
oklch(40.4% 0.145 295.1)
- #484E00
#484E00
oklch(40.5% 0.091 114.7)
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 #51318D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.031
- Blueberry #464196 ΔE 0.042
- Rebecca Purple #663399 ΔE 0.045
- Chrysanthemum #560BAD ΔE 0.070
- Imperial Purple #480CA8 ΔE 0.071
- Indigo #4B0082 ΔE 0.076
- Twilight #4E518B ΔE 0.082
- Cobalt #1E488F ΔE 0.084
Use #51318D 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.