#5B3370
Closest named color: Dark Slate Blue (#483D8B). oklch(39.9% 0.108 312.8), rgb(91, 51, 112).
Aa
White text reads best on this color (9.75:1).
About this color
#5B3370 is a dark, moderately saturated purple. In OKLCH its lightness is 40%, its chroma 0.108 and its hue 313°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.058 away. White text reads best on it, at 9.75:1.
| Hue family | Purples |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.108) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.15:1 |
| White text | 9.75:1 |
Values
| HEX | #5B3370 |
| RGB | rgb(91, 51, 112) |
| HSL | hsl(279, 37%, 32%) |
| OKLCH | oklch(39.9% 0.108 312.8) |
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 #5B3370 | 9.75:1 | AAA | Lc -96.6 | Preferred for body text |
| Black text on #5B3370 | 2.15:1 | Fails | Lc 11.6 | Not readable |
| #5B3370 text on white | 9.75:1 | AAA | Lc 92.3 | Preferred for body text |
| #5B3370 text on black | 2.15:1 | Fails | Lc -10.1 | 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
#EFE6F5
oklch(93.6% 0.022 312.2)
-
Step 200
200
#E4D1EF
oklch(88.5% 0.045 313.3)
-
Step 300
300
#D3B2E6
oklch(80.9% 0.08 313)
-
Step 400
400
#BC88DA
oklch(70.7% 0.128 312.5)
-
Step 500
500
#AB67D0
oklch(63.1% 0.165 312.5)
-
Step 600
600
#974BBC
oklch(55.6% 0.179 313.1)
-
Step 700
700
#803BA2
oklch(48.9% 0.167 312.8)
-
Step 800
800
#683284
oklch(42.7% 0.138 312.4)
-
Step 900
900 (this color)
#5B3370
oklch(39.9% 0.108 312.8)
-
Step 950
950
#321B3E
oklch(27% 0.069 313)
#5B3370 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) | #244272 | 0.092 |
| Deuteranopia (no green cones) | #30456E | 0.083 |
| Tritanopia (no blue cones) | #593D4C | 0.074 |
| Achromatopsia (no color) | #444444 | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B3370
#5B3370
oklch(39.9% 0.108 312.8)
- #2F5306
#2F5306
oklch(40% 0.108 132.8)
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 #5B3370, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.058
- Rebecca Purple #663399 ΔE 0.071
- Grape Purple #5D1451 ΔE 0.076
- Blueberry #464196 ΔE 0.076
- Twilight #4E518B ΔE 0.085
- Rich Purple #720058 ΔE 0.088
- Dusk #4E5481 ΔE 0.089
- Velvet #750851 ΔE 0.090
Use #5B3370 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.