#631804
Closest named color: Reddy Brown (#6E1005). oklch(33.4% 0.111 35.2), rgb(99, 24, 4).
Aa
White text reads best on this color (12.62:1).
About this color
#631804 is a dark, moderately saturated red. In OKLCH its lightness is 33%, its chroma 0.111 and its hue 35°. Its hue sits on the warm side of the wheel. The nearest named color is Reddy Brown (#6E1005), ΔE 0.025 away. White text reads best on it, at 12.62:1.
| Hue family | Reds |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.111) |
| Temperature | warm |
| Nearest name | Reddy Brown (#6E1005) |
| Black text | 1.66:1 |
| White text | 12.62:1 |
Values
| HEX | #631804 |
| RGB | rgb(99, 24, 4) |
| HSL | hsl(13, 92%, 20%) |
| OKLCH | oklch(33.4% 0.111 35.2) |
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 #631804 | 12.62:1 | AAA | Lc -101.1 | Preferred for body text |
| Black text on #631804 | 1.66:1 | Fails | Lc 0.0 | Not readable |
| #631804 text on white | 12.62:1 | AAA | Lc 97.6 | Preferred for body text |
| #631804 text on black | 1.66:1 | 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
#FDF3F0
oklch(97.1% 0.012 37.4)
-
Step 100
100
#F9E5DF
oklch(93.6% 0.023 37.4)
-
Step 200
200
#F6CFC5
oklch(88.5% 0.046 34.7)
-
Step 300
300
#F1AE9C
oklch(80.9% 0.083 35.6)
-
Step 400
400
#E78066
oklch(70.8% 0.133 35.1)
-
Step 500
500
#DC5A3A
oklch(63% 0.17 35)
-
Step 600
600
#C83A11
oklch(55.6% 0.185 35.2)
-
Step 700
700
#AC2B00
oklch(49.1% 0.171 35.3)
-
Step 800
800
#8C2508
oklch(42.7% 0.143 35)
-
Step 900
900 (this color)
#631804
oklch(33.4% 0.111 35.2)
-
Step 950
950
#42170C
oklch(27% 0.07 35.4)
#631804 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) | #2F2801 | 0.115 |
| Deuteranopia (no green cones) | #413900 | 0.104 |
| Tritanopia (no blue cones) | #6E0015 | 0.040 |
| Achromatopsia (no color) | #333333 | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #631804
#631804
oklch(33.4% 0.111 35.2)
- #003E49
#003E49
oklch(33.5% 0.059 214.1)
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 #631804, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Reddy Brown #6E1005 ΔE 0.025
- Claret #680018 ΔE 0.041
- Blood #770001 ΔE 0.045
- Chestnut #742802 ΔE 0.054
- Burgundy #610023 ΔE 0.057
- Maroon #800000 ΔE 0.063
- Wine Red #7B0323 ΔE 0.066
- Bordeaux #7B002C ΔE 0.076
Use #631804 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.