#633971
Closest named color: Dark Slate Blue (#483D8B). oklch(42% 0.102 317.2), rgb(99, 57, 113).
Aa
White text reads best on this color (8.92:1).
About this color
#633971 is a dark, moderately saturated purple. In OKLCH its lightness is 42%, its chroma 0.102 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 8.92:1.
| Hue family | Purples |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.102) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.35:1 |
| White text | 8.92:1 |
Values
| HEX | #633971 |
| RGB | rgb(99, 57, 113) |
| HSL | hsl(285, 33%, 33%) |
| OKLCH | oklch(42% 0.102 317.2) |
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 #633971 | 8.92:1 | AAA | Lc -94.7 | Preferred for body text |
| Black text on #633971 | 2.35:1 | Fails | Lc 13.8 | Not readable |
| #633971 text on white | 8.92:1 | AAA | Lc 90.2 | Preferred for body text |
| #633971 text on black | 2.35:1 | Fails | Lc -12.1 | 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
#EFE6F2
oklch(93.5% 0.019 317.7)
-
Step 200
200
#E2D3E8
oklch(88.5% 0.033 316.4)
-
Step 300
300
#D1B5DA
oklch(80.9% 0.06 317.9)
-
Step 400
400
#B98EC8
oklch(70.7% 0.095 317.2)
-
Step 500
500
#A771BA
oklch(63.2% 0.121 317)
-
Step 600
600
#9258A6
oklch(55.7% 0.132 317)
-
Step 700
700
#7C478E
oklch(49% 0.123 317)
-
Step 800
800 (this color)
#633971
oklch(42% 0.102 317.2)
-
Step 900
900
#52335D
oklch(37.6% 0.079 316.8)
-
Step 950
950
#301E37
oklch(26.9% 0.051 316.1)
#633971 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) | #2F4773 | 0.089 |
| Deuteranopia (no green cones) | #3B4B6F | 0.080 |
| Tritanopia (no blue cones) | #63414F | 0.067 |
| Achromatopsia (no color) | #4A4A4A | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #633971
#633971
oklch(42% 0.102 317.2)
- #30591C
#30591C
oklch(41.9% 0.101 136.9)
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 #633971, 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 0.069
- Twilight #4E518B ΔE 0.075
- Dusk #4E5481 ΔE 0.077
- Blueberry #464196 ΔE 0.079
- Brownish Purple #76424E ΔE 0.081
- Dusty Grape #545775 ΔE 0.084
- Purple Brown #673A3F ΔE 0.086
Use #633971 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.