#40001B
Closest named color: Dark Plum (#3F012C). oklch(24% 0.097 2.6), rgb(64, 0, 27).
Aa
White text reads best on this color (17.02:1).
About this color
#40001B is a very dark, moderately saturated red. In OKLCH its lightness is 24%, its chroma 0.097 and its hue 3°. Its hue sits on the warm side of the wheel. The nearest named color is Dark Plum (#3F012C), ΔE 0.033 away. White text reads best on it, at 17.02:1.
| Hue family | Reds |
| Lightness | very dark (24%) |
| Chroma | moderately saturated (0.097) |
| Temperature | warm |
| Nearest name | Dark Plum (#3F012C) |
| Black text | 1.23:1 |
| White text | 17.02:1 |
Values
| HEX | #40001B |
| RGB | rgb(64, 0, 27) |
| HSL | hsl(335, 100%, 13%) |
| OKLCH | oklch(24% 0.097 2.6) |
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 #40001B | 17.02:1 | AAA | Lc -105.4 | Preferred for body text |
| Black text on #40001B | 1.23:1 | Fails | Lc 0.0 | Not readable |
| #40001B text on white | 17.02:1 | AAA | Lc 102.8 | Preferred for body text |
| #40001B 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
#FFF1F4
oklch(97% 0.016 2.7)
-
Step 100
100
#FEE1E8
oklch(93.5% 0.033 1.4)
-
Step 200
200
#FFC8D5
oklch(88.5% 0.065 2.7)
-
Step 300
300
#FEA1BA
oklch(80.9% 0.114 2.5)
-
Step 400
400
#F96796
oklch(70.8% 0.183 2.9)
-
Step 500
500
#F0297D
oklch(63.1% 0.234 2.5)
-
Step 600
600
#D10067
oklch(55.5% 0.224 2.7)
-
Step 700
700
#B10057
oklch(49.1% 0.198 2.4)
-
Step 800
800
#930046
oklch(42.8% 0.172 3)
-
Step 900
900
#7B003A
oklch(37.6% 0.152 2.7)
-
Step 950
950 (this color)
#40001B
oklch(24% 0.097 2.6)
#40001B 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) | #11141C | 0.110 |
| Deuteranopia (no green cones) | #222119 | 0.100 |
| Tritanopia (no blue cones) | #47000C | 0.032 |
| Achromatopsia (no color) | #1C1C1C | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40001B
#40001B
oklch(24% 0.097 2.6)
- #002621
#002621
oklch(24.1% 0.043 182)
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 #40001B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Plum #3F012C ΔE 0.033
- Dark Maroon #3C0008 ΔE 0.033
- Deep Brown #410200 ΔE 0.046
- Aubergine #3D0734 ΔE 0.047
- Mahogany #4A0100 ΔE 0.051
- Eggplant #380835 ΔE 0.053
- Eggplant Purple #430541 ΔE 0.071
- Dark Purple #35063E ΔE 0.073
Use #40001B 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.