#5B378B
Closest named color: Rebecca Purple (#663399). oklch(42.3% 0.135 300.5), rgb(91, 55, 139).
Aa
White text reads best on this color (8.88:1).
About this color
#5B378B is a dark, moderately saturated purple. In OKLCH its lightness is 42%, its chroma 0.135 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 0.031 away. White text reads best on it, at 8.88:1.
| Hue family | Purples |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.135) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.36:1 |
| White text | 8.88:1 |
Values
| HEX | #5B378B |
| RGB | rgb(91, 55, 139) |
| HSL | hsl(266, 43%, 38%) |
| OKLCH | oklch(42.3% 0.135 300.5) |
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 #5B378B | 8.88:1 | AAA | Lc -94.5 | Preferred for body text |
| Black text on #5B378B | 2.36:1 | Fails | Lc 14.0 | Not readable |
| #5B378B text on white | 8.88:1 | AAA | Lc 90.0 | Fine for body text |
| #5B378B text on black | 2.36:1 | Fails | Lc -12.3 | 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
#ECE7F7
oklch(93.7% 0.022 300.2)
-
Step 200
200
#DDD3F2
oklch(88.4% 0.043 300.2)
-
Step 300
300
#C8B5EC
oklch(80.8% 0.079 300.5)
-
Step 400
400
#AD8DE3
oklch(70.6% 0.127 300.3)
-
Step 500
500
#9A6EDB
oklch(63% 0.162 300.5)
-
Step 600
600
#8554C8
oklch(55.6% 0.174 300.3)
-
Step 700
700
#7143AD
oklch(49% 0.163 300.5)
-
Step 800
800 (this color)
#5B378B
oklch(42.3% 0.135 300.5)
-
Step 900
900
#4B3170
oklch(37.6% 0.106 300.4)
-
Step 950
950
#2C1D42
oklch(26.9% 0.068 300.6)
#5B378B 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) | #0B4A8E | 0.102 |
| Deuteranopia (no green cones) | #1D4989 | 0.093 |
| Tritanopia (no blue cones) | #51485B | 0.102 |
| Achromatopsia (no color) | #4A4A4A | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B378B
#5B378B
oklch(42.3% 0.135 300.5)
- #475500
#475500
oklch(42.2% 0.1 120)
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 #5B378B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.031
- Dark Slate Blue #483D8B ΔE 0.035
- Blueberry #464196 ΔE 0.044
- Twilight #4E518B ΔE 0.068
- Dusk #4E5481 ΔE 0.082
- Chrysanthemum #560BAD ΔE 0.085
- Cobalt #1E488F ΔE 0.091
- Imperial Purple #480CA8 ΔE 0.092
Use #5B378B 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.