#51317B
Closest named color: Dark Slate Blue (#483D8B). oklch(39.1% 0.122 300.8), rgb(81, 49, 123).
Aa
White text reads best on this color (10.11:1).
About this color
#51317B is a dark, moderately saturated purple. In OKLCH its lightness is 39%, its chroma 0.122 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 0.040 away. White text reads best on it, at 10.11:1.
| Hue family | Purples |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.122) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.07:1 |
| White text | 10.11:1 |
Values
| HEX | #51317B |
| RGB | rgb(81, 49, 123) |
| HSL | hsl(266, 43%, 34%) |
| OKLCH | oklch(39.1% 0.122 300.8) |
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 #51317B | 10.11:1 | AAA | Lc -97.3 | Preferred for body text |
| Black text on #51317B | 2.07:1 | Fails | Lc 10.8 | Not readable |
| #51317B text on white | 10.11:1 | AAA | Lc 93.2 | Preferred for body text |
| #51317B text on black | 2.07:1 | Fails | Lc -9.3 | 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
#ECE6F9
oklch(93.5% 0.026 300.3)
-
Step 200
200
#DED2F6
oklch(88.5% 0.051 300.6)
-
Step 300
300
#CAB3F3
oklch(80.8% 0.092 300.8)
-
Step 400
400
#B089ED
oklch(70.7% 0.147 300.7)
-
Step 500
500
#9E68E7
oklch(63.2% 0.187 300.8)
-
Step 600
600
#894BD5
oklch(55.6% 0.203 300.6)
-
Step 700
700
#753AB8
oklch(49% 0.189 301.1)
-
Step 800
800
#5F3295
oklch(42.8% 0.156 300.9)
-
Step 900
900 (this color)
#51317B
oklch(39.1% 0.122 300.8)
-
Step 950
950
#2D1B46
oklch(27% 0.078 300.6)
#51317B 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) | #0E417D | 0.092 |
| Deuteranopia (no green cones) | #1C4179 | 0.084 |
| Tritanopia (no blue cones) | #484051 | 0.092 |
| Achromatopsia (no color) | #424242 | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51317B
#51317B
oklch(39.1% 0.122 300.8)
- #3E4C00
#3E4C00
oklch(39% 0.094 121)
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 #51317B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.040
- Blueberry #464196 ΔE 0.058
- Rebecca Purple #663399 ΔE 0.063
- Indigo #4B0082 ΔE 0.077
- Twilight #4E518B ΔE 0.084
- Royal Purple #4B006E ΔE 0.084
- Grape Purple #5D1451 ΔE 0.089
- Cobalt #1E488F ΔE 0.090
Use #51317B 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.