#63337B
Closest named color: Rebecca Purple (#663399). oklch(41.6% 0.124 313), rgb(99, 51, 123).
Aa
White text reads best on this color (9.17:1).
About this color
#63337B is a dark, moderately saturated purple. In OKLCH its lightness is 42%, its chroma 0.124 and its hue 313°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.050 away. White text reads best on it, at 9.17:1.
| Hue family | Purples |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.124) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.29:1 |
| White text | 9.17:1 |
Values
| HEX | #63337B |
| RGB | rgb(99, 51, 123) |
| HSL | hsl(280, 41%, 34%) |
| OKLCH | oklch(41.6% 0.124 313) |
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 #63337B | 9.17:1 | AAA | Lc -95.1 | Preferred for body text |
| Black text on #63337B | 2.29:1 | Fails | Lc 13.2 | Not readable |
| #63337B text on white | 9.17:1 | AAA | Lc 90.7 | Preferred for body text |
| #63337B text on black | 2.29:1 | Fails | Lc -11.6 | 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
#F8F4FA
oklch(97.2% 0.009 314.8)
-
Step 100
100
#EFE6F4
oklch(93.6% 0.021 313.8)
-
Step 200
200
#E3D2ED
oklch(88.6% 0.041 313.2)
-
Step 300
300
#D1B3E3
oklch(80.8% 0.074 312.7)
-
Step 400
400
#BA8AD4
oklch(70.6% 0.117 313.2)
-
Step 500
500
#A86BC9
oklch(63% 0.149 312.7)
-
Step 600
600
#9451B5
oklch(55.6% 0.161 313.3)
-
Step 700
700
#7E419C
oklch(49.1% 0.15 313.1)
-
Step 800
800 (this color)
#63337B
oklch(41.6% 0.124 313)
-
Step 900
900
#533066
oklch(37.7% 0.097 312.5)
-
Step 950
950
#311C3C
oklch(27% 0.063 313.1)
#63337B 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) | #1E457D | 0.110 |
| Deuteranopia (no green cones) | #304979 | 0.097 |
| Tritanopia (no blue cones) | #613F52 | 0.083 |
| Achromatopsia (no color) | #484848 | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63337B
#63337B
oklch(41.6% 0.124 313)
- #305800
#305800
oklch(41.4% 0.117 133.1)
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 #63337B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.050
- Dark Slate Blue #483D8B ΔE 0.058
- Blueberry #464196 ΔE 0.072
- Purple #800080 ΔE 0.081
- Twilight #4E518B ΔE 0.082
- Grape Purple #5D1451 ΔE 0.089
- Dusk #4E5481 ΔE 0.090
- Rich Purple #720058 ΔE 0.090
Use #63337B 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.