#5B3374
Closest named color: Dark Slate Blue (#483D8B). oklch(40.1% 0.113 310.7), rgb(91, 51, 116).
Aa
White text reads best on this color (9.67:1).
About this color
#5B3374 is a dark, moderately saturated purple. In OKLCH its lightness is 40%, its chroma 0.113 and its hue 311°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.054 away. White text reads best on it, at 9.67:1.
| Hue family | Purples |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.113) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.17:1 |
| White text | 9.67:1 |
Values
| HEX | #5B3374 |
| RGB | rgb(91, 51, 116) |
| HSL | hsl(277, 39%, 33%) |
| OKLCH | oklch(40.1% 0.113 310.7) |
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 #5B3374 | 9.67:1 | AAA | Lc -96.4 | Preferred for body text |
| Black text on #5B3374 | 2.17:1 | Fails | Lc 11.8 | Not readable |
| #5B3374 text on white | 9.67:1 | AAA | Lc 92.1 | Preferred for body text |
| #5B3374 text on black | 2.17:1 | Fails | Lc -10.3 | 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
#F8F3FB
oklch(97% 0.012 313.2)
-
Step 100
100
#EFE6F6
oklch(93.7% 0.023 310.7)
-
Step 200
200
#E3D1F1
oklch(88.5% 0.047 310.5)
-
Step 300
300
#D2B2E9
oklch(81% 0.083 310.8)
-
Step 400
400
#BB87DE
oklch(70.7% 0.134 310.8)
-
Step 500
500
#AA66D5
oklch(63.1% 0.172 310.7)
-
Step 600
600
#954AC2
oklch(55.6% 0.186 310.5)
-
Step 700
700
#7F3AA8
oklch(49.1% 0.174 310.4)
-
Step 800
800
#683188
oklch(42.8% 0.144 310.9)
-
Step 900
900 (this color)
#5B3374
oklch(40.1% 0.113 310.7)
-
Step 950
950
#311B40
oklch(27% 0.071 309.9)
#5B3374 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) | #214376 | 0.094 |
| Deuteranopia (no green cones) | #2E4572 | 0.084 |
| Tritanopia (no blue cones) | #583E4E | 0.078 |
| Achromatopsia (no color) | #444444 | 0.113 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B3374
#5B3374
oklch(40.1% 0.113 310.7)
- #325300
#325300
oklch(40.1% 0.11 131)
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 #5B3374, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.054
- Rebecca Purple #663399 ΔE 0.064
- Blueberry #464196 ΔE 0.071
- Grape Purple #5D1451 ΔE 0.080
- Twilight #4E518B ΔE 0.082
- Dusk #4E5481 ΔE 0.088
- Rich Purple #720058 ΔE 0.091
- Velvet #750851 ΔE 0.094
Use #5B3374 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.