#51307B
Closest named color: Dark Slate Blue (#483D8B). oklch(38.9% 0.123 301.1), rgb(81, 48, 123).
Aa
White text reads best on this color (10.20:1).
About this color
#51307B is a dark, moderately saturated purple. In OKLCH its lightness is 39%, its chroma 0.123 and its hue 301°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.041 away. White text reads best on it, at 10.20:1.
| Hue family | Purples |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.123) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.05:1 |
| White text | 10.20:1 |
Values
| HEX | #51307B |
| RGB | rgb(81, 48, 123) |
| HSL | hsl(266, 44%, 34%) |
| OKLCH | oklch(38.9% 0.123 301.1) |
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 #51307B | 10.20:1 | AAA | Lc -97.4 | Preferred for body text |
| Black text on #51307B | 2.05:1 | Fails | Lc 10.6 | Not readable |
| #51307B text on white | 10.20:1 | AAA | Lc 93.3 | Preferred for body text |
| #51307B text on black | 2.05:1 | Fails | Lc -9.2 | 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 900.
-
Step 50
50
#F7F4FD
oklch(97.2% 0.012 301.3)
-
Step 100
100
#EDE6F9
oklch(93.6% 0.026 302.6)
-
Step 200
200
#DFD2F6
oklch(88.5% 0.051 301.8)
-
Step 300
300
#CBB3F3
oklch(80.9% 0.092 301.5)
-
Step 400
400
#B189EE
oklch(70.8% 0.148 301)
-
Step 500
500
#9F67E8
oklch(63.2% 0.189 301.2)
-
Step 600
600
#8A49D6
oklch(55.5% 0.207 301)
-
Step 700
700
#7639B9
oklch(49.1% 0.192 301.4)
-
Step 800
800
#5F3196
oklch(42.7% 0.158 300.8)
-
Step 900
900 (this color)
#51307B
oklch(38.9% 0.123 301.1)
-
Step 950
950
#2D1B46
oklch(27% 0.078 300.6)
#51307B 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) | #0A417D | 0.094 |
| Deuteranopia (no green cones) | #1A4179 | 0.086 |
| Tritanopia (no blue cones) | #483F50 | 0.093 |
| Achromatopsia (no color) | #414141 | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51307B
#51307B
oklch(38.9% 0.123 301.1)
- #3D4C00
#3D4C00
oklch(38.9% 0.094 121.7)
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 #51307B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.041
- Blueberry #464196 ΔE 0.060
- Rebecca Purple #663399 ΔE 0.063
- Indigo #4B0082 ΔE 0.075
- Royal Purple #4B006E ΔE 0.082
- Twilight #4E518B ΔE 0.087
- Grape Purple #5D1451 ΔE 0.088
- Cobalt #1E488F ΔE 0.091
Use #51307B 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.