#5B3C91
Closest named color: Rebecca Purple (#663399). oklch(43.6% 0.135 297.3), rgb(91, 60, 145).
Aa
White text reads best on this color (8.39:1).
About this color
#5B3C91 is a dark, moderately saturated purple. In OKLCH its lightness is 44%, its chroma 0.135 and its hue 297°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.030 away. White text reads best on it, at 8.39:1.
| Hue family | Purples |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.135) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.50:1 |
| White text | 8.39:1 |
Values
| HEX | #5B3C91 |
| RGB | rgb(91, 60, 145) |
| HSL | hsl(262, 41%, 40%) |
| OKLCH | oklch(43.6% 0.135 297.3) |
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 #5B3C91 | 8.39:1 | AAA | Lc -93.2 | Preferred for body text |
| Black text on #5B3C91 | 2.50:1 | Fails | Lc 15.4 | Dividers and decoration only |
| #5B3C91 text on white | 8.39:1 | AAA | Lc 88.6 | Fine for body text |
| #5B3C91 text on black | 2.50:1 | Fails | Lc -13.5 | 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
#F6F4FC
oklch(97.1% 0.011 297.6)
-
Step 100
100
#EBE7F8
oklch(93.6% 0.023 296.7)
-
Step 200
200
#DCD4F3
oklch(88.6% 0.043 297.3)
-
Step 300
300
#C6B6EE
oklch(80.9% 0.08 297.7)
-
Step 400
400
#A98FE5
oklch(70.7% 0.125 297)
-
Step 500
500
#9570DE
oklch(63.1% 0.162 297)
-
Step 600
600
#8156CB
oklch(55.7% 0.175 297.4)
-
Step 700
700
#6D45B0
oklch(49.1% 0.163 297.2)
-
Step 800
800 (this color)
#5B3C91
oklch(43.6% 0.135 297.3)
-
Step 900
900
#493272
oklch(37.7% 0.107 297.6)
-
Step 950
950
#2A1E43
oklch(27% 0.067 296.6)
#5B3C91 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) | #114E94 | 0.095 |
| Deuteranopia (no green cones) | #1E4C8F | 0.088 |
| Tritanopia (no blue cones) | #4F4E60 | 0.106 |
| Achromatopsia (no color) | #4D4D4D | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B3C91
#5B3C91
oklch(43.6% 0.135 297.3)
- #4E5800
#4E5800
oklch(43.6% 0.101 117.1)
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 #5B3C91, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.030
- Dark Slate Blue #483D8B ΔE 0.035
- Blueberry #464196 ΔE 0.037
- Twilight #4E518B ΔE 0.059
- Dusk #4E5481 ΔE 0.075
- Cobalt #1E488F ΔE 0.086
- Blue With A Hint Of Purple #533CC6 ΔE 0.087
- Chrysanthemum #560BAD ΔE 0.087
Use #5B3C91 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.