#63388C
Closest named color: Rebecca Purple (#663399). oklch(43.5% 0.137 305), rgb(99, 56, 140).
Aa
White text reads best on this color (8.48:1).
About this color
#63388C is a dark, moderately saturated purple. In OKLCH its lightness is 43%, its chroma 0.137 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 0.025 away. White text reads best on it, at 8.48:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.137) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.47:1 |
| White text | 8.48:1 |
Values
| HEX | #63388C |
| RGB | rgb(99, 56, 140) |
| HSL | hsl(271, 43%, 38%) |
| OKLCH | oklch(43.5% 0.137 305) |
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 #63388C | 8.48:1 | AAA | Lc -93.4 | Preferred for body text |
| Black text on #63388C | 2.47:1 | Fails | Lc 15.2 | Dividers and decoration only |
| #63388C text on white | 8.48:1 | AAA | Lc 88.8 | Fine for body text |
| #63388C text on black | 2.47:1 | Fails | Lc -13.4 | 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
#CCB4EB
oklch(80.9% 0.08 304.5)
-
Step 400
400
#B38BE0
oklch(70.7% 0.127 305)
-
Step 500
500
#A16BD7
oklch(63% 0.164 305.3)
-
Step 600
600
#8C50C5
oklch(55.6% 0.178 304.9)
-
Step 700
700
#7740AA
oklch(49.1% 0.165 304.9)
-
Step 800
800 (this color)
#63388C
oklch(43.5% 0.137 305)
-
Step 900
900
#4F306E
oklch(37.8% 0.106 305)
-
Step 950
950
#2E1D40
oklch(27% 0.066 304.8)
#63388C 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) | #144C8F | 0.110 |
| Deuteranopia (no green cones) | #274D8A | 0.099 |
| Tritanopia (no blue cones) | #5C495C | 0.101 |
| Achromatopsia (no color) | #4D4D4D | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63388C
#63388C
oklch(43.5% 0.137 305)
- #435B00
#435B00
oklch(43.5% 0.11 125.4)
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 #63388C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.025
- Dark Slate Blue #483D8B ΔE 0.049
- Blueberry #464196 ΔE 0.055
- Twilight #4E518B ΔE 0.070
- Dusk #4E5481 ΔE 0.083
- Light Eggplant #894585 ΔE 0.085
- Purple #800080 ΔE 0.088
- Chrysanthemum #560BAD ΔE 0.091
Use #63388C 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.