#631D01
Closest named color: Reddy Brown (#6E1005). oklch(34% 0.107 39.2), rgb(99, 29, 1).
Aa
White text reads best on this color (12.30:1).
About this color
#631D01 is a dark, moderately saturated red. In OKLCH its lightness is 34%, its chroma 0.107 and its hue 39°. 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 12.30:1.
| 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 | 12.30:1 |
Values
| HEX | #631D01 |
| RGB | rgb(99, 29, 1) |
| HSL | hsl(17, 98%, 20%) |
| OKLCH | oklch(34% 0.107 39.2) |
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 #631D01 | 12.30:1 | AAA | Lc -100.7 | Preferred for body text |
| Black text on #631D01 | 1.70:1 | Fails | Lc 0.0 | Not readable |
| #631D01 text on white | 12.30:1 | AAA | Lc 97.1 | Preferred for body text |
| #631D01 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
#EFAF9A
oklch(80.9% 0.081 38.9)
-
Step 400
400
#E48362
oklch(70.8% 0.128 39.4)
-
Step 500
500
#D95F33
oklch(63.1% 0.164 39.4)
-
Step 600
600
#C44100
oklch(55.6% 0.177 39.3)
-
Step 700
700
#A63500
oklch(49.1% 0.157 39.1)
-
Step 800
800
#892B00
oklch(42.8% 0.136 39.4)
-
Step 900
900 (this color)
#631D01
oklch(34% 0.107 39.2)
-
Step 950
950
#41180A
oklch(26.9% 0.068 38.9)
#631D01 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 | 0.097 |
| Tritanopia (no blue cones) | #6E0618 | 0.046 |
| Achromatopsia (no color) | #353535 | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #631D01
#631D01
oklch(34% 0.107 39.2)
- #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 #631D01, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Reddy Brown #6E1005 ΔE 0.029
- Chestnut #742802 ΔE 0.047
- Blood #770001 ΔE 0.049
- Claret #680018 ΔE 0.050
- Maroon #800000 ΔE 0.064
- Burgundy #610023 ΔE 0.067
- Wine Red #7B0323 ΔE 0.070
- Chocolate Brown #411900 ΔE 0.080
Use #631D01 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.