#631C40
Closest named color: Merlot (#730039). oklch(35.2% 0.109 352.9), rgb(99, 28, 64).
Aa
White text reads best on this color (11.85:1).
About this color
#631C40 is a dark, moderately saturated red. In OKLCH its lightness is 35%, its chroma 0.109 and its hue 353°. Its hue sits on the warm side of the wheel. The nearest named color is Merlot (#730039), ΔE 0.041 away. White text reads best on it, at 11.85:1.
| Hue family | Reds |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.109) |
| Temperature | warm |
| Nearest name | Merlot (#730039) |
| Black text | 1.77:1 |
| White text | 11.85:1 |
Values
| HEX | #631C40 |
| RGB | rgb(99, 28, 64) |
| HSL | hsl(330, 56%, 25%) |
| OKLCH | oklch(35.2% 0.109 352.9) |
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 #631C40 | 11.85:1 | AAA | Lc -100.1 | Preferred for body text |
| Black text on #631C40 | 1.77:1 | Fails | Lc 7.5 | Not readable |
| #631C40 text on white | 11.85:1 | AAA | Lc 96.4 | Preferred for body text |
| #631C40 text on black | 1.77:1 | Fails | Lc 0.0 | 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
#FCF3F6
oklch(97.2% 0.01 354.9)
-
Step 100
100
#F8E4EB
oklch(93.7% 0.024 354.3)
-
Step 200
200
#F2CDDC
oklch(88.4% 0.046 351.7)
-
Step 300
300
#EBABC5
oklch(80.9% 0.082 353)
-
Step 400
400
#DE7CA8
oklch(70.7% 0.131 352.6)
-
Step 500
500
#D25792
oklch(63.1% 0.167 353)
-
Step 600
600
#BD377D
oklch(55.6% 0.182 352.6)
-
Step 700
700
#A32869
oklch(49.1% 0.169 353)
-
Step 800
800
#842356
oklch(42.6% 0.14 352.5)
-
Step 900
900 (this color)
#631C40
oklch(35.2% 0.109 352.9)
-
Step 950
950
#3F1629
oklch(27.1% 0.069 353.7)
#631C40 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) | #272F41 | 0.122 |
| Deuteranopia (no green cones) | #3B3C3E | 0.109 |
| Tritanopia (no blue cones) | #6B172B | 0.038 |
| Achromatopsia (no color) | #373737 | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #631C40
#631C40
oklch(35.2% 0.109 352.9)
- #004638
#004638
oklch(35.2% 0.067 173.7)
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 #631C40, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Merlot #730039 ΔE 0.041
- Grape Purple #5D1451 ΔE 0.041
- Velvet #750851 ΔE 0.052
- Burgundy #610023 ΔE 0.053
- Bordeaux #7B002C ΔE 0.060
- Rich Purple #720058 ΔE 0.061
- Wine #80013F ΔE 0.062
- Claret #680018 ΔE 0.063
Use #631C40 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.