#631F18
Closest named color: Reddy Brown (#6E1005). oklch(34.5% 0.1 29.1), rgb(99, 31, 24).
Aa
White text reads best on this color (12.07:1).
About this color
#631F18 is a dark, moderately saturated red. In OKLCH its lightness is 34%, its chroma 0.100 and its hue 29°. Its hue sits on the warm side of the wheel. The nearest named color is Reddy Brown (#6E1005), ΔE 0.029 away. White text reads best on it, at 12.07:1.
| Hue family | Reds |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.100) |
| Temperature | warm |
| Nearest name | Reddy Brown (#6E1005) |
| Black text | 1.73:1 |
| White text | 12.07:1 |
Values
| HEX | #631F18 |
| RGB | rgb(99, 31, 24) |
| HSL | hsl(6, 61%, 24%) |
| OKLCH | oklch(34.5% 0.1 29.1) |
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 #631F18 | 12.07:1 | AAA | Lc -100.5 | Preferred for body text |
| Black text on #631F18 | 1.73:1 | Fails | Lc 0.0 | Not readable |
| #631F18 text on white | 12.07:1 | AAA | Lc 96.8 | Preferred for body text |
| #631F18 text on black | 1.73:1 | 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
#FCF3F2
oklch(97.1% 0.01 25.1)
-
Step 100
100
#F8E5E2
oklch(93.6% 0.021 28.3)
-
Step 200
200
#F4D0CA
oklch(88.6% 0.042 29.1)
-
Step 300
300
#EDAFA5
oklch(80.9% 0.075 29.1)
-
Step 400
400
#E18275
oklch(70.6% 0.12 28.7)
-
Step 500
500
#D65F51
oklch(63.1% 0.153 28.9)
-
Step 600
600
#C24134
oklch(55.7% 0.167 29.2)
-
Step 700
700
#A73227
oklch(49.2% 0.155 29.2)
-
Step 800
800
#872B22
oklch(42.7% 0.127 29)
-
Step 900
900 (this color)
#631F18
oklch(34.5% 0.1 29.1)
-
Step 950
950
#401813
oklch(26.9% 0.064 29.2)
#631F18 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) | #322D17 | 0.104 |
| Deuteranopia (no green cones) | #433C16 | 0.097 |
| Tritanopia (no blue cones) | #6D0E1E | 0.034 |
| Achromatopsia (no color) | #363636 | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #631F18
#631F18
oklch(34.5% 0.1 29.1)
- #00414A
#00414A
oklch(34.4% 0.06 210.2)
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 #631F18, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Reddy Brown #6E1005 ΔE 0.029
- Claret #680018 ΔE 0.041
- Blood #770001 ΔE 0.048
- Chestnut #742802 ΔE 0.050
- Burgundy #610023 ΔE 0.055
- Wine Red #7B0323 ΔE 0.060
- Maroon #800000 ΔE 0.063
- Bordeaux #7B002C ΔE 0.068
Use #631F18 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.