#631B73
Closest named color: Grape Purple (#5D1451). oklch(38% 0.151 319.6), rgb(99, 27, 115).
Aa
White text reads best on this color (10.85:1).
About this color
#631B73 is a dark, vivid purple. In OKLCH its lightness is 38%, its chroma 0.151 and its hue 320°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Grape Purple (#5D1451), ΔE 0.060 away. White text reads best on it, at 10.85:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | vivid (0.151) |
| Temperature | in between |
| Nearest name | Grape Purple (#5D1451) |
| Black text | 1.93:1 |
| White text | 10.85:1 |
Values
| HEX | #631B73 |
| RGB | rgb(99, 27, 115) |
| HSL | hsl(289, 62%, 28%) |
| OKLCH | oklch(38% 0.151 319.6) |
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 #631B73 | 10.85:1 | AAA | Lc -98.2 | Preferred for body text |
| Black text on #631B73 | 1.93:1 | Fails | Lc 9.7 | Not readable |
| #631B73 text on white | 10.85:1 | AAA | Lc 94.2 | Preferred for body text |
| #631B73 text on black | 1.93:1 | Fails | Lc -8.4 | 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 900.
-
Step 50
50
#FAF2FC
oklch(97% 0.016 319.4)
-
Step 100
100
#F4E3F8
oklch(93.6% 0.033 319.8)
-
Step 200
200
#ECCCF4
oklch(88.4% 0.064 319.5)
-
Step 300
300
#E1A9EF
oklch(81% 0.113 319.5)
-
Step 400
400
#D076E6
oklch(70.6% 0.181 319.5)
-
Step 500
500
#C34ADF
oklch(63.2% 0.232 319.5)
-
Step 600
600
#AE1CCC
oklch(55.5% 0.252 319.5)
-
Step 700
700
#9603B0
oklch(49.1% 0.234 319.9)
-
Step 800
800
#79108F
oklch(42.6% 0.194 319.4)
-
Step 900
900 (this color)
#631B73
oklch(38% 0.151 319.6)
-
Step 950
950
#3A1243
oklch(27.1% 0.096 319.8)
#631B73 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) | #003875 | 0.149 |
| Deuteranopia (no green cones) | #223F71 | 0.131 |
| Tritanopia (no blue cones) | #632D45 | 0.095 |
| Achromatopsia (no color) | #3D3D3D | 0.152 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #631B73
#631B73
oklch(38% 0.151 319.6)
- #165000
#165000
oklch(37.9% 0.121 139.5)
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 #631B73, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grape Purple #5D1451 ΔE 0.060
- Rich Purple #720058 ΔE 0.060
- Purple #800080 ΔE 0.064
- Royal Purple #4B006E ΔE 0.067
- Indigo #4B0082 ΔE 0.071
- Velvet #750851 ΔE 0.072
- Rebecca Purple #663399 ΔE 0.075
- Plum Purple #4E0550 ΔE 0.081
Use #631B73 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.