#633D8C
Closest named color: Rebecca Purple (#663399). oklch(44.3% 0.129 303.8), rgb(99, 61, 140).
Aa
White text reads best on this color (8.14:1).
About this color
#633D8C is a dark, moderately saturated purple. In OKLCH its lightness is 44%, its chroma 0.129 and its hue 304°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.032 away. White text reads best on it, at 8.14:1.
| Hue family | Purples |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.129) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.57:1 |
| White text | 8.14:1 |
Values
| HEX | #633D8C |
| RGB | rgb(99, 61, 140) |
| HSL | hsl(269, 39%, 39%) |
| OKLCH | oklch(44.3% 0.129 303.8) |
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 #633D8C | 8.14:1 | AAA | Lc -92.6 | Preferred for body text |
| Black text on #633D8C | 2.57:1 | Fails | Lc 16.1 | Dividers and decoration only |
| #633D8C text on white | 8.14:1 | AAA | Lc 87.9 | Fine for body text |
| #633D8C text on black | 2.57:1 | Fails | Lc -14.3 | 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
#EDE7F6
oklch(93.7% 0.021 304)
-
Step 200
200
#DFD3F0
oklch(88.5% 0.041 304.3)
-
Step 300
300
#CBB5E9
oklch(80.9% 0.076 304)
-
Step 400
400
#B18DDE
oklch(70.7% 0.121 303.9)
-
Step 500
500
#9E6FD4
oklch(63.2% 0.153 303.8)
-
Step 600
600
#8954C1
oklch(55.6% 0.167 303.9)
-
Step 700
700
#7444A7
oklch(49.1% 0.155 303.5)
-
Step 800
800 (this color)
#633D8C
oklch(44.3% 0.129 303.8)
-
Step 900
900
#4D326C
oklch(37.7% 0.099 303.5)
-
Step 950
950
#2D1E3F
oklch(27.1% 0.062 303.5)
#633D8C 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) | #204E8F | 0.098 |
| Deuteranopia (no green cones) | #2D4F8A | 0.089 |
| Tritanopia (no blue cones) | #5C4C5E | 0.096 |
| Achromatopsia (no color) | #4F4F4F | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #633D8C
#633D8C
oklch(44.3% 0.129 303.8)
- #475D00
#475D00
oklch(44.4% 0.11 124)
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 #633D8C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.032
- Dark Slate Blue #483D8B ΔE 0.049
- Blueberry #464196 ΔE 0.053
- Twilight #4E518B ΔE 0.060
- Dusk #4E5481 ΔE 0.073
- Light Eggplant #894585 ΔE 0.080
- Dusty Grape #545775 ΔE 0.089
- Denim Blue #3B5B92 ΔE 0.093
Use #633D8C 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.