#5B377F
Closest named color: Dark Slate Blue (#483D8B). oklch(41.5% 0.12 304.8), rgb(91, 55, 127).
Aa
White text reads best on this color (9.13:1).
About this color
#5B377F is a dark, moderately saturated purple. In OKLCH its lightness is 41%, its chroma 0.120 and its hue 305°. 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 9.13:1.
| Hue family | Purples |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.120) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.29:1 |
| White text | 9.13:1 |
Values
| HEX | #5B377F |
| RGB | rgb(91, 55, 127) |
| HSL | hsl(270, 40%, 36%) |
| OKLCH | oklch(41.5% 0.12 304.8) |
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 #5B377F | 9.13:1 | AAA | Lc -95.1 | Preferred for body text |
| Black text on #5B377F | 2.29:1 | Fails | Lc 13.2 | Not readable |
| #5B377F text on white | 9.13:1 | AAA | Lc 90.8 | Preferred for body text |
| #5B377F text on black | 2.29:1 | Fails | Lc -11.6 | 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
#F7F4FB
oklch(97.1% 0.01 305.4)
-
Step 100
100
#EDE7F5
oklch(93.7% 0.02 305.3)
-
Step 200
200
#DFD3EE
oklch(88.5% 0.039 305.6)
-
Step 300
300
#CBB6E6
oklch(81% 0.07 304.8)
-
Step 400
400
#B18ED9
oklch(70.7% 0.113 305.1)
-
Step 500
500
#9E71CE
oklch(63.2% 0.142 305)
-
Step 600
600
#8957BB
oklch(55.7% 0.155 305)
-
Step 700
700
#7446A1
oklch(49% 0.145 305)
-
Step 800
800 (this color)
#5B377F
oklch(41.5% 0.12 304.8)
-
Step 900
900
#4D3369
oklch(37.7% 0.093 304.6)
-
Step 950
950
#2D1E3D
oklch(26.9% 0.059 305.1)
#5B377F 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) | #1E4781 | 0.093 |
| Deuteranopia (no green cones) | #2A487D | 0.084 |
| Tritanopia (no blue cones) | #554555 | 0.089 |
| Achromatopsia (no color) | #484848 | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B377F
#5B377F
oklch(41.5% 0.12 304.8)
- #3F5500
#3F5500
oklch(41.6% 0.105 125)
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 #5B377F, 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
- Rebecca Purple #663399 ΔE 0.048
- Blueberry #464196 ΔE 0.055
- Twilight #4E518B ΔE 0.069
- Dusk #4E5481 ΔE 0.079
- Dusty Grape #545775 ΔE 0.093
- Cobalt #1E488F ΔE 0.094
- Purple #800080 ΔE 0.097
Use #5B377F 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.