#631D03
Closest named color: Reddy Brown (#6E1005). oklch(34% 0.107 38.4), rgb(99, 29, 3).
Aa
White text reads best on this color (12.29:1).
About this color
#631D03 is a dark, moderately saturated red. In OKLCH its lightness is 34%, its chroma 0.107 and its hue 38°. Its hue sits on the warm side of the wheel. The nearest named color is Reddy Brown (#6E1005), ΔE 0.028 away. White text reads best on it, at 12.29:1.
| Hue family | Reds |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.107) |
| Temperature | warm |
| Nearest name | Reddy Brown (#6E1005) |
| Black text | 1.70:1 |
| White text | 12.29:1 |
Values
| HEX | #631D03 |
| RGB | rgb(99, 29, 3) |
| HSL | hsl(16, 94%, 20%) |
| OKLCH | oklch(34% 0.107 38.4) |
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 #631D03 | 12.29:1 | AAA | Lc -100.7 | Preferred for body text |
| Black text on #631D03 | 1.70:1 | Fails | Lc 0.0 | Not readable |
| #631D03 text on white | 12.29:1 | AAA | Lc 97.1 | Preferred for body text |
| #631D03 text on black | 1.70:1 | 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
#FCF3F0
oklch(97% 0.011 39.4)
-
Step 100
100
#F9E5DF
oklch(93.6% 0.023 37.4)
-
Step 200
200
#F4D0C4
oklch(88.5% 0.044 39.3)
-
Step 300
300
#EFAF9B
oklch(80.9% 0.081 38.1)
-
Step 400
400
#E48264
oklch(70.7% 0.129 37.8)
-
Step 500
500
#D95F36
oklch(63.2% 0.163 38.6)
-
Step 600
600
#C44006
oklch(55.5% 0.177 38.4)
-
Step 700
700
#A73300
oklch(49% 0.16 38.2)
-
Step 800
800
#892A02
oklch(42.7% 0.136 38.6)
-
Step 900
900 (this color)
#631D03
oklch(34% 0.107 38.4)
-
Step 950
950
#41180B
oklch(26.9% 0.068 38)
#631D03 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) | #322B00 | 0.107 |
| Deuteranopia (no green cones) | #433B00 | 0.098 |
| Tritanopia (no blue cones) | #6E0618 | 0.045 |
| Achromatopsia (no color) | #353535 | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #631D03
#631D03
oklch(34% 0.107 38.4)
- #003F4D
#003F4D
oklch(34% 0.061 218.5)
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 #631D03, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Reddy Brown #6E1005 ΔE 0.028
- Chestnut #742802 ΔE 0.048
- Blood #770001 ΔE 0.048
- Claret #680018 ΔE 0.049
- Maroon #800000 ΔE 0.064
- Burgundy #610023 ΔE 0.066
- Wine Red #7B0323 ΔE 0.069
- Bordeaux #7B002C ΔE 0.080
Use #631D03 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.