#633B80
Closest named color: Rebecca Purple (#663399). oklch(43.2% 0.117 309.1), rgb(99, 59, 128).
Aa
White text reads best on this color (8.50:1).
About this color
#633B80 is a dark, moderately saturated purple. In OKLCH its lightness is 43%, its chroma 0.117 and its hue 309°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.047 away. White text reads best on it, at 8.50:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.117) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.46:1 |
| White text | 8.50:1 |
Values
| HEX | #633B80 |
| RGB | rgb(99, 59, 128) |
| HSL | hsl(275, 37%, 37%) |
| OKLCH | oklch(43.2% 0.117 309.1) |
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 #633B80 | 8.50:1 | AAA | Lc -93.6 | Preferred for body text |
| Black text on #633B80 | 2.46:1 | Fails | Lc 15.0 | Not readable |
| #633B80 text on white | 8.50:1 | AAA | Lc 89.0 | Fine for body text |
| #633B80 text on black | 2.46:1 | 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
#F7F4FA
oklch(97.1% 0.009 308.4)
-
Step 100
100
#EEE7F4
oklch(93.7% 0.019 309.8)
-
Step 200
200
#E0D3ED
oklch(88.5% 0.038 308)
-
Step 300
300
#CEB5E3
oklch(80.9% 0.069 309.4)
-
Step 400
400
#B58DD4
oklch(70.7% 0.11 309.6)
-
Step 500
500
#A26FC9
oklch(63% 0.14 309)
-
Step 600
600
#8D56B5
oklch(55.6% 0.151 309)
-
Step 700
700
#78459C
oklch(49% 0.142 309.2)
-
Step 800
800 (this color)
#633B80
oklch(43.2% 0.117 309.1)
-
Step 900
900
#503266
oklch(37.7% 0.092 309.3)
-
Step 950
950
#2F1E3C
oklch(27.1% 0.058 309.1)
#633B80 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) | #284B82 | 0.094 |
| Deuteranopia (no green cones) | #344D7E | 0.085 |
| Tritanopia (no blue cones) | #5F4757 | 0.084 |
| Achromatopsia (no color) | #4D4D4D | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #633B80
#633B80
oklch(43.2% 0.117 309.1)
- #3C5C00
#3C5C00
oklch(43.3% 0.115 129.2)
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 #633B80, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.047
- Dark Slate Blue #483D8B ΔE 0.052
- Blueberry #464196 ΔE 0.062
- Twilight #4E518B ΔE 0.064
- Dusk #4E5481 ΔE 0.073
- Light Eggplant #894585 ΔE 0.080
- Dusty Grape #545775 ΔE 0.085
- Purple #800080 ΔE 0.092
Use #633B80 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.