#5B3989
Closest named color: Dark Slate Blue (#483D8B). oklch(42.5% 0.129 300.6), rgb(91, 57, 137).
Aa
White text reads best on this color (8.78:1).
About this color
#5B3989 is a dark, moderately saturated purple. In OKLCH its lightness is 43%, its chroma 0.129 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 0.034 away. White text reads best on it, at 8.78:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.129) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.39:1 |
| White text | 8.78:1 |
Values
| HEX | #5B3989 |
| RGB | rgb(91, 57, 137) |
| HSL | hsl(266, 41%, 38%) |
| OKLCH | oklch(42.5% 0.129 300.6) |
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 #5B3989 | 8.78:1 | AAA | Lc -94.2 | Preferred for body text |
| Black text on #5B3989 | 2.39:1 | Fails | Lc 14.2 | Not readable |
| #5B3989 text on white | 8.78:1 | AAA | Lc 89.7 | Fine for body text |
| #5B3989 text on black | 2.39:1 | Fails | Lc -12.5 | 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
#F6F4FB
oklch(97.1% 0.009 299.2)
-
Step 100
100
#ECE7F7
oklch(93.7% 0.022 300.2)
-
Step 200
200
#DDD3F1
oklch(88.4% 0.042 300.7)
-
Step 300
300
#C8B6EB
oklch(80.9% 0.076 300.3)
-
Step 400
400
#AD8EE0
oklch(70.6% 0.121 300.7)
-
Step 500
500
#9A70D7
oklch(63.1% 0.154 300.9)
-
Step 600
600
#8556C5
oklch(55.7% 0.168 300.6)
-
Step 700
700
#7145AA
oklch(49.1% 0.157 300.9)
-
Step 800
800 (this color)
#5B3989
oklch(42.5% 0.129 300.6)
-
Step 900
900
#4B326E
oklch(37.6% 0.101 300.9)
-
Step 950
950
#2C1E40
oklch(27% 0.063 301.3)
#5B3989 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) | #154A8C | 0.096 |
| Deuteranopia (no green cones) | #234A87 | 0.088 |
| Tritanopia (no blue cones) | #52495B | 0.098 |
| Achromatopsia (no color) | #4B4B4B | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B3989
#5B3989
oklch(42.5% 0.129 300.6)
- #475600
#475600
oklch(42.5% 0.102 120.6)
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 #5B3989, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.034
- Rebecca Purple #663399 ΔE 0.035
- Blueberry #464196 ΔE 0.044
- Twilight #4E518B ΔE 0.064
- Dusk #4E5481 ΔE 0.077
- Cobalt #1E488F ΔE 0.089
- Chrysanthemum #560BAD ΔE 0.091
- Dusk Blue #26538D ΔE 0.094
Use #5B3989 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.