#400303
Closest named color: Deep Brown (#410200). oklch(23.8% 0.091 27.9), rgb(64, 3, 3).
Aa
White text reads best on this color (17.04:1).
About this color
#400303 is a very dark, moderately saturated red. In OKLCH its lightness is 24%, its chroma 0.091 and its hue 28°. Its hue sits on the warm side of the wheel. The nearest named color is Deep Brown (#410200), ΔE 0.005 away. White text reads best on it, at 17.04:1.
| Hue family | Reds |
| Lightness | very dark (24%) |
| Chroma | moderately saturated (0.091) |
| Temperature | warm |
| Nearest name | Deep Brown (#410200) |
| Black text | 1.23:1 |
| White text | 17.04:1 |
Values
| HEX | #400303 |
| RGB | rgb(64, 3, 3) |
| HSL | hsl(0, 91%, 13%) |
| OKLCH | oklch(23.8% 0.091 27.9) |
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 #400303 | 17.04:1 | AAA | Lc -105.5 | Preferred for body text |
| Black text on #400303 | 1.23:1 | Fails | Lc 0.0 | Not readable |
| #400303 text on white | 17.04:1 | AAA | Lc 103.0 | Preferred for body text |
| #400303 text on black | 1.23:1 | 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 950.
-
Step 50
50
#FFF2F0
oklch(97.1% 0.014 28)
-
Step 100
100
#FEE3DE
oklch(93.6% 0.031 30.2)
-
Step 200
200
#FFCBC3
oklch(88.6% 0.06 28.4)
-
Step 300
300
#FFA59A
oklch(80.9% 0.109 27.3)
-
Step 400
400
#FA6F61
oklch(70.8% 0.173 28)
-
Step 500
500
#F23932
oklch(63% 0.221 27.9)
-
Step 600
600
#D90010
oklch(55.6% 0.227 27.9)
-
Step 700
700
#B8000B
oklch(49.2% 0.201 28)
-
Step 800
800
#980008
oklch(42.7% 0.175 27.8)
-
Step 900
900
#7D0D0C
oklch(37.8% 0.145 28.1)
-
Step 950
950 (this color)
#400303
oklch(23.8% 0.091 27.9)
#400303 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) | #171302 | 0.100 |
| Deuteranopia (no green cones) | #262101 | 0.091 |
| Tritanopia (no blue cones) | #480004 | 0.019 |
| Achromatopsia (no color) | #1C1C1C | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #400303
#400303
oklch(23.8% 0.091 27.9)
- #002429
#002429
oklch(23.8% 0.041 208.4)
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 #400303, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Brown #410200 ΔE 0.005
- Dark Maroon #3C0008 ΔE 0.017
- Mahogany #4A0100 ΔE 0.024
- Chocolate Brown #411900 ΔE 0.048
- Dark Brown #341C02 ΔE 0.060
- Dark Plum #3F012C ΔE 0.073
- Aubergine #3D0734 ΔE 0.085
- Eggplant #380835 ΔE 0.090
Use #400303 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.