#5B3187
Closest named color: Rebecca Purple (#663399). oklch(41.1% 0.139 303.3), rgb(91, 49, 135).
Aa
White text reads best on this color (9.40:1).
About this color
#5B3187 is a dark, moderately saturated purple. In OKLCH its lightness is 41%, its chroma 0.139 and its hue 303°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.036 away. White text reads best on it, at 9.40:1.
| Hue family | Purples |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.139) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.23:1 |
| White text | 9.40:1 |
Values
| HEX | #5B3187 |
| RGB | rgb(91, 49, 135) |
| HSL | hsl(269, 47%, 36%) |
| OKLCH | oklch(41.1% 0.139 303.3) |
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 #5B3187 | 9.40:1 | AAA | Lc -95.6 | Preferred for body text |
| Black text on #5B3187 | 2.23:1 | Fails | Lc 12.7 | Not readable |
| #5B3187 text on white | 9.40:1 | AAA | Lc 91.3 | Preferred for body text |
| #5B3187 text on black | 2.23:1 | Fails | Lc -11.1 | 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 800.
-
Step 50
50
#F7F4FC
oklch(97.2% 0.011 303.1)
-
Step 100
100
#EDE6F7
oklch(93.5% 0.024 304.5)
-
Step 200
200
#DFD2F2
oklch(88.4% 0.046 303.9)
-
Step 300
300
#CBB4EC
oklch(80.8% 0.081 303.4)
-
Step 400
400
#B18BE3
oklch(70.6% 0.131 303.1)
-
Step 500
500
#9F6CDB
oklch(63.2% 0.166 303.2)
-
Step 600
600
#8A50C8
oklch(55.5% 0.181 303.3)
-
Step 700
700
#7540AD
oklch(49% 0.168 303.1)
-
Step 800
800 (this color)
#5B3187
oklch(41.1% 0.139 303.3)
-
Step 900
900
#4E3070
oklch(37.8% 0.108 303.2)
-
Step 950
950
#2E1D42
oklch(27.2% 0.069 303.4)
#5B3187 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) | #00458A | 0.112 |
| Deuteranopia (no green cones) | #194685 | 0.102 |
| Tritanopia (no blue cones) | #534357 | 0.103 |
| Achromatopsia (no color) | #464646 | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B3187
#5B3187
oklch(41.1% 0.139 303.3)
- #405300
#405300
oklch(41.1% 0.101 123.5)
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 #5B3187, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.036
- Dark Slate Blue #483D8B ΔE 0.042
- Blueberry #464196 ΔE 0.054
- Chrysanthemum #560BAD ΔE 0.081
- Twilight #4E518B ΔE 0.081
- Indigo #4B0082 ΔE 0.082
- Imperial Purple #480CA8 ΔE 0.088
- Purple #800080 ΔE 0.090
Use #5B3187 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.