#633B71
Closest named color: Dark Slate Blue (#483D8B). oklch(42.3% 0.098 316.9), rgb(99, 59, 113).
Aa
White text reads best on this color (8.76:1).
About this color
#633B71 is a dark, moderately saturated purple. In OKLCH its lightness is 42%, its chroma 0.098 and its hue 317°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.065 away. White text reads best on it, at 8.76:1.
| Hue family | Purples |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.098) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.39:1 |
| White text | 8.76:1 |
Values
| HEX | #633B71 |
| RGB | rgb(99, 59, 113) |
| HSL | hsl(284, 31%, 34%) |
| OKLCH | oklch(42.3% 0.098 316.9) |
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 #633B71 | 8.76:1 | AAA | Lc -94.3 | Preferred for body text |
| Black text on #633B71 | 2.39:1 | Fails | Lc 14.2 | Not readable |
| #633B71 text on white | 8.76:1 | AAA | Lc 89.8 | Fine for body text |
| #633B71 text on black | 2.39:1 | Fails | Lc -12.4 | 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
#F8F4F9
oklch(97.2% 0.008 319.4)
-
Step 100
100
#EEE7F1
oklch(93.6% 0.015 316)
-
Step 200
200
#E2D3E7
oklch(88.5% 0.031 317.7)
-
Step 300
300
#D0B6DA
oklch(81% 0.057 316.6)
-
Step 400
400
#B88FC7
oklch(70.8% 0.092 316.8)
-
Step 500
500
#A672B8
oklch(63.1% 0.117 317.1)
-
Step 600
600
#9159A4
oklch(55.6% 0.127 317.1)
-
Step 700
700
#7B498D
oklch(49.1% 0.118 316.6)
-
Step 800
800 (this color)
#633B71
oklch(42.3% 0.098 316.9)
-
Step 900
900
#52345C
oklch(37.8% 0.076 317.4)
-
Step 950
950
#301F36
oklch(27.1% 0.047 317)
#633B71 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) | #314873 | 0.085 |
| Deuteranopia (no green cones) | #3C4C6F | 0.077 |
| Tritanopia (no blue cones) | #634250 | 0.064 |
| Achromatopsia (no color) | #4B4B4B | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #633B71
#633B71
oklch(42.3% 0.098 316.9)
- #325A1F
#325A1F
oklch(42.4% 0.099 136.9)
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 #633B71, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.065
- Rebecca Purple #663399 ΔE 0.071
- Twilight #4E518B ΔE 0.071
- Dusk #4E5481 ΔE 0.073
- Brownish Purple #76424E ΔE 0.078
- Dusty Grape #545775 ΔE 0.079
- Blueberry #464196 ΔE 0.079
- Purple Brown #673A3F ΔE 0.084
Use #633B71 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.