#631B15
Closest named color: Reddy Brown (#6E1005). oklch(33.9% 0.105 28.6), rgb(99, 27, 21).
Aa
White text reads best on this color (12.36:1).
About this color
#631B15 is a dark, moderately saturated red. In OKLCH its lightness is 34%, its chroma 0.105 and its hue 29°. Its hue sits on the warm side of the wheel. The nearest named color is Reddy Brown (#6E1005), ΔE 0.026 away. White text reads best on it, at 12.36:1.
| Hue family | Reds |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.105) |
| Temperature | warm |
| Nearest name | Reddy Brown (#6E1005) |
| Black text | 1.69:1 |
| White text | 12.36:1 |
Values
| HEX | #631B15 |
| RGB | rgb(99, 27, 21) |
| HSL | hsl(5, 65%, 24%) |
| OKLCH | oklch(33.9% 0.105 28.6) |
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 #631B15 | 12.36:1 | AAA | Lc -100.8 | Preferred for body text |
| Black text on #631B15 | 1.69:1 | Fails | Lc 0.0 | Not readable |
| #631B15 text on white | 12.36:1 | AAA | Lc 97.3 | Preferred for body text |
| #631B15 text on black | 1.69:1 | 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
#FCF3F1
oklch(97.1% 0.01 32.5)
-
Step 100
100
#F9E5E1
oklch(93.7% 0.023 31.1)
-
Step 200
200
#F5CFC9
oklch(88.5% 0.044 28.5)
-
Step 300
300
#EFAEA4
oklch(80.9% 0.078 28.7)
-
Step 400
400
#E48073
oklch(70.6% 0.126 28.4)
-
Step 500
500
#D95C4E
oklch(63.1% 0.16 28.8)
-
Step 600
600
#C53D32
oklch(55.7% 0.174 28.6)
-
Step 700
700
#AA2D24
oklch(49.2% 0.163 28.7)
-
Step 800
800
#8A2720
oklch(42.7% 0.135 28.2)
-
Step 900
900 (this color)
#631B15
oklch(33.9% 0.105 28.6)
-
Step 950
950
#411713
oklch(26.9% 0.066 27.8)
#631B15 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) | #302A14 | 0.110 |
| Deuteranopia (no green cones) | #413A12 | 0.102 |
| Tritanopia (no blue cones) | #6E051A | 0.034 |
| Achromatopsia (no color) | #343434 | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #631B15
#631B15
oklch(33.9% 0.105 28.6)
- #004048
#004048
oklch(34% 0.059 208.7)
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 #631B15, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Reddy Brown #6E1005 ΔE 0.026
- Claret #680018 ΔE 0.035
- Blood #770001 ΔE 0.046
- Burgundy #610023 ΔE 0.050
- Chestnut #742802 ΔE 0.054
- Wine Red #7B0323 ΔE 0.059
- Maroon #800000 ΔE 0.062
- Bordeaux #7B002C ΔE 0.067
Use #631B15 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.