#6C378B
Closest named color: Rebecca Purple (#663399). oklch(44.4% 0.14 311.1), rgb(108, 55, 139).
Aa
White text reads best on this color (8.21:1).
About this color
#6C378B is a dark, moderately saturated purple. In OKLCH its lightness is 44%, its chroma 0.140 and its hue 311°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.029 away. White text reads best on it, at 8.21:1.
| Hue family | Purples |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.140) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.55:1 |
| White text | 8.21:1 |
Values
| HEX | #6C378B |
| RGB | rgb(108, 55, 139) |
| HSL | hsl(278, 43%, 38%) |
| OKLCH | oklch(44.4% 0.14 311.1) |
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 #6C378B | 8.21:1 | AAA | Lc -92.6 | Preferred for body text |
| Black text on #6C378B | 2.55:1 | Fails | Lc 16.0 | Dividers and decoration only |
| #6C378B text on white | 8.21:1 | AAA | Lc 88.0 | Fine for body text |
| #6C378B text on black | 2.55:1 | Fails | Lc -14.2 | 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
#F8F3FB
oklch(97% 0.012 313.2)
-
Step 100
100
#EFE6F6
oklch(93.7% 0.023 310.7)
-
Step 200
200
#E3D1F0
oklch(88.5% 0.046 311.2)
-
Step 300
300
#D2B2E8
oklch(80.9% 0.082 311.3)
-
Step 400
400
#BB88DC
oklch(70.7% 0.13 311.3)
-
Step 500
500
#AA67D2
oklch(63.1% 0.167 311.4)
-
Step 600
600
#954BBF
oklch(55.5% 0.182 311.3)
-
Step 700
700
#7F3CA5
oklch(49.1% 0.168 311.1)
-
Step 800
800 (this color)
#6C378B
oklch(44.4% 0.14 311.1)
-
Step 900
900
#542D6B
oklch(37.7% 0.109 311.3)
-
Step 950
950
#311B3F
oklch(27% 0.069 310.8)
#6C378B 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) | #1A4C8E | 0.122 |
| Deuteranopia (no green cones) | #305089 | 0.108 |
| Tritanopia (no blue cones) | #68465B | 0.096 |
| Achromatopsia (no color) | #4F4F4F | 0.141 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6C378B
#6C378B
oklch(44.4% 0.14 311.1)
- #3A6000
#3A6000
oklch(44.3% 0.121 131.2)
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 #6C378B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.029
- Dark Slate Blue #483D8B ΔE 0.066
- Light Eggplant #894585 ΔE 0.071
- Blueberry #464196 ΔE 0.072
- Purple #800080 ΔE 0.076
- Twilight #4E518B ΔE 0.079
- Warm Purple #952E8F ΔE 0.081
- Dark Magenta #8B008B ΔE 0.083
Use #6C378B 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.