#5B3988
Closest named color: Dark Slate Blue (#483D8B). oklch(42.4% 0.128 301), rgb(91, 57, 136).
Aa
White text reads best on this color (8.80:1).
About this color
#5B3988 is a dark, moderately saturated purple. In OKLCH its lightness is 42%, its chroma 0.128 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 8.80:1.
| Hue family | Purples |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.128) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.38:1 |
| White text | 8.80:1 |
Values
| HEX | #5B3988 |
| RGB | rgb(91, 57, 136) |
| HSL | hsl(266, 41%, 38%) |
| OKLCH | oklch(42.4% 0.128 301) |
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 #5B3988 | 8.80:1 | AAA | Lc -94.3 | Preferred for body text |
| Black text on #5B3988 | 2.38:1 | Fails | Lc 14.2 | Not readable |
| #5B3988 text on white | 8.80:1 | AAA | Lc 89.8 | Fine for body text |
| #5B3988 text on black | 2.38:1 | Fails | Lc -12.4 | 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
#ECE7F6
oklch(93.6% 0.021 301.1)
-
Step 200
200
#DDD3F1
oklch(88.4% 0.042 300.7)
-
Step 300
300
#C8B6EA
oklch(80.9% 0.075 300.6)
-
Step 400
400
#AD8EDF
oklch(70.6% 0.12 301)
-
Step 500
500
#9A70D6
oklch(63.1% 0.153 301.1)
-
Step 600
600
#8556C4
oklch(55.6% 0.167 300.8)
-
Step 700
700
#7145A9
oklch(49.1% 0.155 301.1)
-
Step 800
800 (this color)
#5B3988
oklch(42.4% 0.128 301)
-
Step 900
900
#4B326D
oklch(37.6% 0.1 301.3)
-
Step 950
950
#2C1E40
oklch(27% 0.063 301.3)
#5B3988 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) | #174A8B | 0.095 |
| Deuteranopia (no green cones) | #244A86 | 0.087 |
| Tritanopia (no blue cones) | #52495B | 0.097 |
| Achromatopsia (no color) | #4A4A4A | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B3988
#5B3988
oklch(42.4% 0.128 301)
- #465600
#465600
oklch(42.4% 0.102 121.2)
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 #5B3988, 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 0.036
- Blueberry #464196 ΔE 0.045
- Twilight #4E518B ΔE 0.064
- Dusk #4E5481 ΔE 0.077
- Cobalt #1E488F ΔE 0.089
- Chrysanthemum #560BAD ΔE 0.092
- Dusk Blue #26538D ΔE 0.094
Use #5B3988 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.