#631D37
Closest named color: Merlot (#730039). oklch(35% 0.104 1.2), rgb(99, 29, 55).
Aa
White text reads best on this color (11.92:1).
About this color
#631D37 is a dark, moderately saturated red. In OKLCH its lightness is 35%, its chroma 0.104 and its hue 1°. Its hue sits on the warm side of the wheel. The nearest named color is Merlot (#730039), ΔE 0.043 away. White text reads best on it, at 11.92:1.
| Hue family | Reds |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.104) |
| Temperature | warm |
| Nearest name | Merlot (#730039) |
| Black text | 1.76:1 |
| White text | 11.92:1 |
Values
| HEX | #631D37 |
| RGB | rgb(99, 29, 55) |
| HSL | hsl(338, 55%, 25%) |
| OKLCH | oklch(35% 0.104 1.2) |
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 #631D37 | 11.92:1 | AAA | Lc -100.2 | Preferred for body text |
| Black text on #631D37 | 1.76:1 | Fails | Lc 7.3 | Not readable |
| #631D37 text on white | 11.92:1 | AAA | Lc 96.6 | Preferred for body text |
| #631D37 text on black | 1.76:1 | 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
#FCF3F5
oklch(97.2% 0.01 2)
-
Step 100
100
#F8E4E9
oklch(93.6% 0.023 0.5)
-
Step 200
200
#F3CED7
oklch(88.5% 0.043 1.6)
-
Step 300
300
#ECACBD
oklch(80.9% 0.078 1.5)
-
Step 400
400
#DF7E9C
oklch(70.7% 0.124 0.9)
-
Step 500
500
#D35983
oklch(63% 0.159 1.2)
-
Step 600
600
#BF3A6D
oklch(55.6% 0.174 1.2)
-
Step 700
700
#A42B5B
oklch(49.1% 0.161 1.1)
-
Step 800
800
#85264A
oklch(42.7% 0.133 1.4)
-
Step 900
900 (this color)
#631D37
oklch(35% 0.104 1.2)
-
Step 950
950
#3F1724
oklch(27% 0.064 2)
#631D37 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) | #2B2E38 | 0.115 |
| Deuteranopia (no green cones) | #3E3C35 | 0.105 |
| Tritanopia (no blue cones) | #6C1527 | 0.031 |
| Achromatopsia (no color) | #373737 | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #631D37
#631D37
oklch(35% 0.104 1.2)
- #00453C
#00453C
oklch(35% 0.063 180.5)
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 #631D37, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Merlot #730039 ΔE 0.043
- Burgundy #610023 ΔE 0.045
- Claret #680018 ΔE 0.050
- Bordeaux #7B002C ΔE 0.055
- Grape Purple #5D1451 ΔE 0.057
- Wine Red #7B0323 ΔE 0.058
- Velvet #750851 ΔE 0.064
- Reddy Brown #6E1005 ΔE 0.064
Use #631D37 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.