#042123
Closest named color: Rich Black (#0D1B2A). oklch(22.7% 0.034 201.5), rgb(4, 33, 35).
Aa
White text reads best on this color (16.84:1).
About this color
#042123 is a very dark, muted teal or cyan. In OKLCH its lightness is 23%, its chroma 0.034 and its hue 201°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.031 away. White text reads best on it, at 16.84:1.
| Hue family | Teals and cyans |
| Lightness | very dark (23%) |
| Chroma | muted (0.034) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.24:1 |
| White text | 16.84:1 |
Values
| HEX | #042123 |
| RGB | rgb(4, 33, 35) |
| HSL | hsl(184, 79%, 8%) |
| OKLCH | oklch(22.7% 0.034 201.5) |
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 #042123 | 16.84:1 | AAA | Lc -106.0 | Preferred for body text |
| Black text on #042123 | 1.24:1 | Fails | Lc 0.0 | Not readable |
| #042123 text on white | 16.84:1 | AAA | Lc 103.6 | Preferred for body text |
| #042123 text on black | 1.24:1 | 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
#F1F7F7
oklch(97.2% 0.006 197.1)
-
Step 100
100
#E1ECED
oklch(93.5% 0.012 203.5)
-
Step 200
200
#C9DEDF
oklch(88.5% 0.022 200.2)
-
Step 300
300
#A3C9CC
oklch(80.9% 0.041 202.3)
-
Step 400
400
#6EADB2
oklch(70.7% 0.065 202.2)
-
Step 500
500
#41999F
oklch(63.2% 0.084 201.4)
-
Step 600
600
#148389
oklch(55.7% 0.091 200.8)
-
Step 700
700
#006E74
oklch(49% 0.083 201.4)
-
Step 800
800
#0A5A5F
oklch(42.7% 0.07 201.7)
-
Step 900
900
#154A4E
oklch(37.7% 0.055 202.3)
-
Step 950
950 (this color)
#042123
oklch(22.7% 0.034 201.5)
#042123 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) | #1E1F23 | 0.035 |
| Deuteranopia (no green cones) | #191C23 | 0.031 |
| Tritanopia (no blue cones) | #002322 | 0.009 |
| Achromatopsia (no color) | #1D1D1D | 0.035 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #042123
#042123
oklch(22.7% 0.034 201.5)
- #2A1615
#2A1615
oklch(22.8% 0.033 23.1)
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 #042123, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.031
- Dark #1B2431 ΔE 0.043
- Jet #212529 ΔE 0.045
- Oxford Blue #1B263B ΔE 0.058
- Rich Navy #001219 ΔE 0.060
- Dark Forest Green #002D04 ΔE 0.077
- Almost Black #070D0D ΔE 0.079
- Very Dark Green #062E03 ΔE 0.080
Use #042123 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.