#5B3378
Closest named color: Dark Slate Blue (#483D8B). oklch(40.4% 0.118 308.8), rgb(91, 51, 120).
Aa
White text reads best on this color (9.59:1).
About this color
#5B3378 is a dark, moderately saturated purple. In OKLCH its lightness is 40%, its chroma 0.118 and its hue 309°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.050 away. White text reads best on it, at 9.59:1.
| Hue family | Purples |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.118) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.18:1 |
| White text | 9.59:1 |
Values
| HEX | #5B3378 |
| RGB | rgb(91, 51, 120) |
| HSL | hsl(275, 40%, 34%) |
| OKLCH | oklch(40.4% 0.118 308.8) |
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 #5B3378 | 9.59:1 | AAA | Lc -96.2 | Preferred for body text |
| Black text on #5B3378 | 2.18:1 | Fails | Lc 12.1 | Not readable |
| #5B3378 text on white | 9.59:1 | AAA | Lc 91.9 | Preferred for body text |
| #5B3378 text on black | 2.18:1 | 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
#F7F4FA
oklch(97.1% 0.009 308.4)
-
Step 100
100
#EEE7F4
oklch(93.7% 0.019 309.8)
-
Step 200
200
#E0D3ED
oklch(88.5% 0.038 308)
-
Step 300
300
#CDB5E3
oklch(80.9% 0.069 308.4)
-
Step 400
400
#B48DD5
oklch(70.6% 0.111 308.6)
-
Step 500
500
#A26FC9
oklch(63% 0.14 309)
-
Step 600
600
#8D56B6
oklch(55.6% 0.152 308.7)
-
Step 700
700
#78459D
oklch(49.1% 0.143 308.8)
-
Step 800
800 (this color)
#5B3378
oklch(40.4% 0.118 308.8)
-
Step 900
900
#503266
oklch(37.7% 0.092 309.3)
-
Step 950
950
#2F1E3C
oklch(27.1% 0.058 309.1)
#5B3378 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) | #1D437A | 0.097 |
| Deuteranopia (no green cones) | #2B4676 | 0.088 |
| Tritanopia (no blue cones) | #573F50 | 0.083 |
| Achromatopsia (no color) | #454545 | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B3378
#5B3378
oklch(40.4% 0.118 308.8)
- #365300
#365300
oklch(40.4% 0.107 129)
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 #5B3378, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.050
- Rebecca Purple #663399 ΔE 0.058
- Blueberry #464196 ΔE 0.066
- Twilight #4E518B ΔE 0.080
- Grape Purple #5D1451 ΔE 0.085
- Dusk #4E5481 ΔE 0.088
- Indigo #4B0082 ΔE 0.091
- Purple #800080 ΔE 0.093
Use #5B3378 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.