#5B3191
Closest named color: Rebecca Purple (#663399). oklch(41.8% 0.151 300), rgb(91, 49, 145).
Aa
White text reads best on this color (9.15:1).
About this color
#5B3191 is a dark, vivid purple. In OKLCH its lightness is 42%, its chroma 0.151 and its hue 300°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.025 away. White text reads best on it, at 9.15:1.
| Hue family | Purples |
| Lightness | dark (42%) |
| Chroma | vivid (0.151) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.29:1 |
| White text | 9.15:1 |
Values
| HEX | #5B3191 |
| RGB | rgb(91, 49, 145) |
| HSL | hsl(266, 49%, 38%) |
| OKLCH | oklch(41.8% 0.151 300) |
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 #5B3191 | 9.15:1 | AAA | Lc -95.0 | Preferred for body text |
| Black text on #5B3191 | 2.29:1 | Fails | Lc 13.4 | Not readable |
| #5B3191 text on white | 9.15:1 | AAA | Lc 90.6 | Preferred for body text |
| #5B3191 text on black | 2.29:1 | Fails | Lc -11.7 | 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
#F6F4FC
oklch(97.1% 0.011 297.6)
-
Step 100
100
#ECE6F9
oklch(93.5% 0.026 300.3)
-
Step 200
200
#DED2F6
oklch(88.5% 0.051 300.6)
-
Step 300
300
#C9B4F2
oklch(80.9% 0.089 299.9)
-
Step 400
400
#AF8AEB
oklch(70.7% 0.142 300.4)
-
Step 500
500
#9C6AE5
oklch(63.2% 0.181 300)
-
Step 600
600
#874DD3
oklch(55.5% 0.198 299.9)
-
Step 700
700
#733DB7
oklch(49.1% 0.184 300)
-
Step 800
800 (this color)
#5B3191
oklch(41.8% 0.151 300)
-
Step 900
900
#4C2E76
oklch(37.6% 0.119 299.9)
-
Step 950
950
#2C1C45
oklch(26.9% 0.075 299.4)
#5B3191 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) | #004894 | 0.110 |
| Deuteranopia (no green cones) | #01478F | 0.110 |
| Tritanopia (no blue cones) | #4F475C | 0.116 |
| Achromatopsia (no color) | #484848 | 0.152 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B3191
#5B3191
oklch(41.8% 0.151 300)
- #465400
#465400
oklch(41.9% 0.1 120.1)
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 #5B3191, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.025
- Dark Slate Blue #483D8B ΔE 0.043
- Blueberry #464196 ΔE 0.049
- Chrysanthemum #560BAD ΔE 0.068
- Imperial Purple #480CA8 ΔE 0.077
- Twilight #4E518B ΔE 0.082
- Grape #7209B7 ΔE 0.083
- Indigo #4B0082 ΔE 0.084
Use #5B3191 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.