#5B288B
Closest named color: Rebecca Purple (#663399). oklch(40.2% 0.157 303.6), rgb(91, 40, 139).
Aa
White text reads best on this color (9.90:1).
About this color
#5B288B is a dark, vivid purple. In OKLCH its lightness is 40%, its chroma 0.157 and its hue 304°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.039 away. White text reads best on it, at 9.90:1.
| Hue family | Purples |
| Lightness | dark (40%) |
| Chroma | vivid (0.157) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.12:1 |
| White text | 9.90:1 |
Values
| HEX | #5B288B |
| RGB | rgb(91, 40, 139) |
| HSL | hsl(271, 55%, 35%) |
| OKLCH | oklch(40.2% 0.157 303.6) |
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 #5B288B | 9.90:1 | AAA | Lc -96.5 | Preferred for body text |
| Black text on #5B288B | 2.12:1 | Fails | Lc 11.7 | Not readable |
| #5B288B text on white | 9.90:1 | AAA | Lc 92.3 | Preferred for body text |
| #5B288B text on black | 2.12:1 | 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
#F7F3FE
oklch(97% 0.015 302.6)
-
Step 100
100
#EEE5FD
oklch(93.6% 0.033 302.7)
-
Step 200
200
#E2CFFD
oklch(88.5% 0.066 303.9)
-
Step 300
300
#D1AEFF
oklch(81% 0.117 303.7)
-
Step 400
400
#BA7EFF
oklch(70.8% 0.188 303.4)
-
Step 500
500
#AA54FC
oklch(63.1% 0.239 303.7)
-
Step 600
600
#962BEC
oklch(55.6% 0.261 303.4)
-
Step 700
700
#8018CD
oklch(49.1% 0.243 303.5)
-
Step 800
800
#681AA6
oklch(42.7% 0.202 303.5)
-
Step 900
900 (this color)
#5B288B
oklch(40.2% 0.157 303.6)
-
Step 950
950
#31154D
oklch(27% 0.099 303.3)
#5B288B 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) | #00428E | 0.119 |
| Deuteranopia (no green cones) | #004389 | 0.120 |
| Tritanopia (no blue cones) | #523F56 | 0.114 |
| Achromatopsia (no color) | #434343 | 0.158 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B288B
#5B288B
oklch(40.2% 0.157 303.6)
- #3E5000
#3E5000
oklch(40.1% 0.099 123.2)
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 #5B288B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.039
- Dark Slate Blue #483D8B ΔE 0.055
- Blueberry #464196 ΔE 0.065
- Chrysanthemum #560BAD ΔE 0.066
- Indigo #4B0082 ΔE 0.067
- Imperial Purple #480CA8 ΔE 0.074
- Royal Purple #4B006E ΔE 0.084
- Grape #7209B7 ΔE 0.085
Use #5B288B 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.