#04231B
Closest named color: Rich Black (#0D1B2A). oklch(23.1% 0.04 172.5), rgb(4, 35, 27).
Aa
White text reads best on this color (16.64:1).
About this color
#04231B is a very dark, muted teal or cyan. In OKLCH its lightness is 23%, its chroma 0.040 and its hue 172°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.050 away. White text reads best on it, at 16.64:1.
| Hue family | Teals and cyans |
| Lightness | very dark (23%) |
| Chroma | muted (0.040) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.26:1 |
| White text | 16.64:1 |
Values
| HEX | #04231B |
| RGB | rgb(4, 35, 27) |
| HSL | hsl(165, 79%, 8%) |
| OKLCH | oklch(23.1% 0.04 172.5) |
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 #04231B | 16.64:1 | AAA | Lc -105.9 | Preferred for body text |
| Black text on #04231B | 1.26:1 | Fails | Lc 0.0 | Not readable |
| #04231B text on white | 16.64:1 | AAA | Lc 103.4 | Preferred for body text |
| #04231B text on black | 1.26:1 | 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
#F1F7F5
oklch(97.1% 0.007 174.4)
-
Step 100
100
#E1EDE9
oklch(93.6% 0.014 174.2)
-
Step 200
200
#C9DFD7
oklch(88.5% 0.026 171.9)
-
Step 300
300
#A2CBBD
oklch(80.9% 0.048 172.2)
-
Step 400
400
#6DB09C
oklch(70.6% 0.075 173.1)
-
Step 500
500
#3F9C83
oklch(63% 0.096 172.5)
-
Step 600
600
#0C876D
oklch(55.7% 0.105 172.5)
-
Step 700
700
#00725B
oklch(49.2% 0.095 172.3)
-
Step 800
800
#055D4A
oklch(42.7% 0.081 172.2)
-
Step 900
900
#144C3E
oklch(37.6% 0.062 172.8)
-
Step 950
950 (this color)
#04231B
oklch(23.1% 0.04 172.5)
#04231B 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) | #22201B | 0.042 |
| Deuteranopia (no green cones) | #1D1D1C | 0.039 |
| Tritanopia (no blue cones) | #002321 | 0.012 |
| Achromatopsia (no color) | #1E1E1E | 0.040 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #04231B
#04231B
oklch(23.1% 0.04 172.5)
- #2B151F
#2B151F
oklch(23.1% 0.039 351.9)
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 #04231B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.050
- Jet #212529 ΔE 0.050
- Dark #1B2431 ΔE 0.054
- Dark Forest Green #002D04 ΔE 0.058
- Very Dark Green #062E03 ΔE 0.062
- Rich Navy #001219 ΔE 0.069
- Oxford Blue #1B263B ΔE 0.070
- Dark Brown #341C02 ΔE 0.080
Use #04231B 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.