#631D40
Closest named color: Merlot (#730039). oklch(35.3% 0.108 353.2), rgb(99, 29, 64).
Aa
White text reads best on this color (11.79:1).
About this color
#631D40 is a dark, moderately saturated red. In OKLCH its lightness is 35%, its chroma 0.108 and its hue 353°. Its hue sits on the warm side of the wheel. The nearest named color is Merlot (#730039), ΔE 0.042 away. White text reads best on it, at 11.79:1.
| Hue family | Reds |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.108) |
| Temperature | warm |
| Nearest name | Merlot (#730039) |
| Black text | 1.78:1 |
| White text | 11.79:1 |
Values
| HEX | #631D40 |
| RGB | rgb(99, 29, 64) |
| HSL | hsl(330, 55%, 25%) |
| OKLCH | oklch(35.3% 0.108 353.2) |
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 #631D40 | 11.79:1 | AAA | Lc -100.0 | Preferred for body text |
| Black text on #631D40 | 1.78:1 | Fails | Lc 7.6 | Not readable |
| #631D40 text on white | 11.79:1 | AAA | Lc 96.3 | Preferred for body text |
| #631D40 text on black | 1.78:1 | 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
#F7E4EB
oklch(93.6% 0.023 353.2)
-
Step 200
200
#F2CEDB
oklch(88.6% 0.044 354.3)
-
Step 300
300
#EBABC5
oklch(80.9% 0.082 353)
-
Step 400
400
#DE7DA7
oklch(70.8% 0.129 353.5)
-
Step 500
500
#D15892
oklch(63.1% 0.164 352.9)
-
Step 600
600
#BD387C
oklch(55.6% 0.18 353.2)
-
Step 700
700
#A22968
oklch(49% 0.167 353.3)
-
Step 800
800
#842455
oklch(42.7% 0.139 353.3)
-
Step 900
900 (this color)
#631D40
oklch(35.3% 0.108 353.2)
-
Step 950
950
#3F1629
oklch(27.1% 0.069 353.7)
#631D40 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) | #283041 | 0.120 |
| Deuteranopia (no green cones) | #3C3C3E | 0.106 |
| Tritanopia (no blue cones) | #6B182B | 0.038 |
| Achromatopsia (no color) | #383838 | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #631D40
#631D40
oklch(35.3% 0.108 353.2)
- #004738
#004738
oklch(35.5% 0.068 172.7)
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 #631D40, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Merlot #730039 ΔE 0.042
- Grape Purple #5D1451 ΔE 0.042
- Velvet #750851 ΔE 0.053
- Burgundy #610023 ΔE 0.054
- Bordeaux #7B002C ΔE 0.060
- Rich Purple #720058 ΔE 0.062
- Wine #80013F ΔE 0.063
- Claret #680018 ΔE 0.063
Use #631D40 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.