#63398B
Closest named color: Rebecca Purple (#663399). oklch(43.6% 0.134 305.1), rgb(99, 57, 139).
Aa
White text reads best on this color (8.43:1).
About this color
#63398B is a dark, moderately saturated purple. In OKLCH its lightness is 44%, its chroma 0.134 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 0.027 away. White text reads best on it, at 8.43:1.
| Hue family | Purples |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.134) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.48:1 |
| White text | 8.43:1 |
Values
| HEX | #63398B |
| RGB | rgb(99, 57, 139) |
| HSL | hsl(271, 42%, 38%) |
| OKLCH | oklch(43.6% 0.134 305.1) |
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 #63398B | 8.43:1 | AAA | Lc -93.3 | Preferred for body text |
| Black text on #63398B | 2.48:1 | Fails | Lc 15.3 | Dividers and decoration only |
| #63398B text on white | 8.43:1 | AAA | Lc 88.7 | Fine for body text |
| #63398B text on black | 2.48:1 | 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
#F7F4FB
oklch(97.1% 0.01 305.4)
-
Step 100
100
#EDE6F6
oklch(93.5% 0.023 305.6)
-
Step 200
200
#E0D2F1
oklch(88.5% 0.045 305.9)
-
Step 300
300
#CCB4EA
oklch(80.8% 0.079 304.9)
-
Step 400
400
#B38CDF
oklch(70.8% 0.125 305)
-
Step 500
500
#A06CD6
oklch(63% 0.161 304.9)
-
Step 600
600
#8C51C3
oklch(55.6% 0.175 305.3)
-
Step 700
700
#7741A8
oklch(49.1% 0.162 305.4)
-
Step 800
800 (this color)
#63398B
oklch(43.6% 0.134 305.1)
-
Step 900
900
#4F306D
oklch(37.7% 0.105 305.4)
-
Step 950
950
#2E1D40
oklch(27% 0.066 304.8)
#63398B 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) | #184C8E | 0.107 |
| Deuteranopia (no green cones) | #294D89 | 0.096 |
| Tritanopia (no blue cones) | #5C495C | 0.098 |
| Achromatopsia (no color) | #4D4D4D | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63398B
#63398B
oklch(43.6% 0.134 305.1)
- #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 #63398B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.027
- Dark Slate Blue #483D8B ΔE 0.049
- Blueberry #464196 ΔE 0.055
- Twilight #4E518B ΔE 0.068
- Dusk #4E5481 ΔE 0.081
- Light Eggplant #894585 ΔE 0.084
- Purple #800080 ΔE 0.089
- Chrysanthemum #560BAD ΔE 0.094
Use #63398B 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.