#183B42
Closest named color: Midnight Green (#073B4C). oklch(33% 0.042 212.5), rgb(24, 59, 66).
Aa
White text reads best on this color (12.04:1).
About this color
#183B42 is a dark, muted teal or cyan. In OKLCH its lightness is 33%, its chroma 0.042 and its hue 213°. Its hue sits on the cool side of the wheel. The nearest named color is Midnight Green (#073B4C), ΔE 0.020 away. White text reads best on it, at 12.04:1.
| Hue family | Teals and cyans |
| Lightness | dark (33%) |
| Chroma | muted (0.042) |
| Temperature | cool |
| Nearest name | Midnight Green (#073B4C) |
| Black text | 1.74:1 |
| White text | 12.04:1 |
Values
| HEX | #183B42 |
| RGB | rgb(24, 59, 66) |
| HSL | hsl(190, 47%, 18%) |
| OKLCH | oklch(33% 0.042 212.5) |
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 #183B42 | 12.04:1 | AAA | Lc -101.0 | Preferred for body text |
| Black text on #183B42 | 1.74:1 | Fails | Lc 0.0 | Not readable |
| #183B42 text on white | 12.04:1 | AAA | Lc 97.4 | Preferred for body text |
| #183B42 text on black | 1.74:1 | 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
#F2F6F7
oklch(97% 0.004 214.3)
-
Step 100
100
#E3ECED
oklch(93.7% 0.01 204.9)
-
Step 200
200
#CDDCE0
oklch(88.4% 0.017 215.5)
-
Step 300
300
#AAC6CD
oklch(80.8% 0.032 214.5)
-
Step 400
400
#7CA9B3
oklch(70.6% 0.05 212.9)
-
Step 500
500
#5994A0
oklch(63.1% 0.064 212)
-
Step 600
600
#3C7E8B
oklch(55.5% 0.07 212.2)
-
Step 700
700
#2E6A76
oklch(49% 0.064 212.7)
-
Step 800
800
#275760
oklch(42.7% 0.054 211.5)
-
Step 900
900 (this color)
#183B42
oklch(33% 0.042 212.5)
-
Step 950
950
#162A2E
oklch(27% 0.027 211.7)
#183B42 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) | #363942 | 0.039 |
| Deuteranopia (no green cones) | #2F3442 | 0.036 |
| Tritanopia (no blue cones) | #003E3D | 0.022 |
| Achromatopsia (no color) | #363636 | 0.042 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #183B42
#183B42
oklch(33% 0.042 212.5)
- #492D27
#492D27
oklch(33% 0.043 32.7)
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 #183B42, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Midnight Green #073B4C ΔE 0.020
- Dark Blue Grey #1F3B4D ΔE 0.022
- Gunmetal #293241 ΔE 0.034
- Onyx #343A40 ΔE 0.036
- Charcoal #264653 ΔE 0.047
- Prussian Blue #1D3557 ΔE 0.048
- Space Cadet #2B2D42 ΔE 0.051
- Charcoal Grey #3C4142 ΔE 0.054
Use #183B42 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.