#63378C
Closest named color: Rebecca Purple (#663399). oklch(43.3% 0.138 305.2), rgb(99, 55, 140).
Aa
White text reads best on this color (8.55:1).
About this color
#63378C is a dark, moderately saturated purple. In OKLCH its lightness is 43%, its chroma 0.138 and its hue 305°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.024 away. White text reads best on it, at 8.55:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.138) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.45:1 |
| White text | 8.55:1 |
Values
| HEX | #63378C |
| RGB | rgb(99, 55, 140) |
| HSL | hsl(271, 44%, 38%) |
| OKLCH | oklch(43.3% 0.138 305.2) |
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 #63378C | 8.55:1 | AAA | Lc -93.6 | Preferred for body text |
| Black text on #63378C | 2.45:1 | Fails | Lc 15.0 | Not readable |
| #63378C text on white | 8.55:1 | AAA | Lc 89.0 | Fine for body text |
| #63378C text on black | 2.45:1 | Fails | Lc -13.2 | 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
#F7F4FB
oklch(97.1% 0.01 305.4)
-
Step 100
100
#EDE6F7
oklch(93.5% 0.024 304.5)
-
Step 200
200
#E0D2F1
oklch(88.5% 0.045 305.9)
-
Step 300
300
#CDB4EB
oklch(81% 0.081 305.4)
-
Step 400
400
#B48BE1
oklch(70.8% 0.129 305.3)
-
Step 500
500
#A16BD8
oklch(63.1% 0.165 305)
-
Step 600
600
#8D50C5
oklch(55.7% 0.179 305.4)
-
Step 700
700
#783FAA
oklch(49% 0.167 305.6)
-
Step 800
800 (this color)
#63378C
oklch(43.3% 0.138 305.2)
-
Step 900
900
#4F2F6E
oklch(37.6% 0.108 305.3)
-
Step 950
950
#2E1C41
oklch(26.9% 0.069 304.6)
#63378C 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) | #114B8F | 0.112 |
| Deuteranopia (no green cones) | #254C8A | 0.101 |
| Tritanopia (no blue cones) | #5C485C | 0.101 |
| Achromatopsia (no color) | #4C4C4C | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63378C
#63378C
oklch(43.3% 0.138 305.2)
- #435A00
#435A00
oklch(43.3% 0.109 124.9)
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 #63378C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.024
- Dark Slate Blue #483D8B ΔE 0.049
- Blueberry #464196 ΔE 0.056
- Twilight #4E518B ΔE 0.072
- Dusk #4E5481 ΔE 0.085
- Purple #800080 ΔE 0.087
- Light Eggplant #894585 ΔE 0.087
- Chrysanthemum #560BAD ΔE 0.089
Use #63378C 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.