#633981
Closest named color: Rebecca Purple (#663399). oklch(42.9% 0.121 309.1), rgb(99, 57, 129).
Aa
White text reads best on this color (8.63:1).
About this color
#633981 is a dark, moderately saturated purple. In OKLCH its lightness is 43%, its chroma 0.121 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 0.043 away. White text reads best on it, at 8.63:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.121) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.43:1 |
| White text | 8.63:1 |
Values
| HEX | #633981 |
| RGB | rgb(99, 57, 129) |
| HSL | hsl(275, 39%, 36%) |
| OKLCH | oklch(42.9% 0.121 309.1) |
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 #633981 | 8.63:1 | AAA | Lc -93.9 | Preferred for body text |
| Black text on #633981 | 2.43:1 | Fails | Lc 14.7 | Not readable |
| #633981 text on white | 8.63:1 | AAA | Lc 89.3 | Fine for body text |
| #633981 text on black | 2.43:1 | Fails | Lc -12.9 | 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
#EEE6F5
oklch(93.6% 0.022 309.6)
-
Step 200
200
#E1D3ED
oklch(88.6% 0.038 309.6)
-
Step 300
300
#CEB5E4
oklch(81% 0.07 308.9)
-
Step 400
400
#B58CD6
oklch(70.6% 0.114 309.1)
-
Step 500
500
#A36ECB
oklch(63.1% 0.145 309.1)
-
Step 600
600
#8E54B8
oklch(55.6% 0.158 308.9)
-
Step 700
700
#79449E
oklch(49.1% 0.146 309.2)
-
Step 800
800 (this color)
#633981
oklch(42.9% 0.121 309.1)
-
Step 900
900
#503167
oklch(37.6% 0.095 309)
-
Step 950
950
#2F1D3C
oklch(26.9% 0.06 309.7)
#633981 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) | #234A83 | 0.100 |
| Deuteranopia (no green cones) | #314C7F | 0.090 |
| Tritanopia (no blue cones) | #5F4657 | 0.087 |
| Achromatopsia (no color) | #4C4C4C | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #633981
#633981
oklch(42.9% 0.121 309.1)
- #3B5B00
#3B5B00
oklch(43% 0.115 129.3)
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 #633981, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.043
- Dark Slate Blue #483D8B ΔE 0.052
- Blueberry #464196 ΔE 0.062
- Twilight #4E518B ΔE 0.068
- Dusk #4E5481 ΔE 0.077
- Light Eggplant #894585 ΔE 0.082
- Purple #800080 ΔE 0.089
- Dusty Grape #545775 ΔE 0.090
Use #633981 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.