#183A44
Closest named color: Midnight Green (#073B4C). oklch(32.8% 0.043 219.7), rgb(24, 58, 68).
Aa
White text reads best on this color (12.15:1).
About this color
#183A44 is a dark, muted teal or cyan. In OKLCH its lightness is 33%, its chroma 0.043 and its hue 220°. Its hue sits on the cool side of the wheel. The nearest named color is Midnight Green (#073B4C), ΔE 0.017 away. White text reads best on it, at 12.15:1.
| Hue family | Teals and cyans |
| Lightness | dark (33%) |
| Chroma | muted (0.043) |
| Temperature | cool |
| Nearest name | Midnight Green (#073B4C) |
| Black text | 1.72:1 |
| White text | 12.15:1 |
Values
| HEX | #183A44 |
| RGB | rgb(24, 58, 68) |
| HSL | hsl(194, 48%, 18%) |
| OKLCH | oklch(32.8% 0.043 219.7) |
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 #183A44 | 12.15:1 | AAA | Lc -101.1 | Preferred for body text |
| Black text on #183A44 | 1.72:1 | Fails | Lc 0.0 | Not readable |
| #183A44 text on white | 12.15:1 | AAA | Lc 97.6 | Preferred for body text |
| #183A44 text on black | 1.72:1 | 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
#E3EBEE
oklch(93.5% 0.009 222.1)
-
Step 200
200
#CDDCE1
oklch(88.5% 0.018 219.7)
-
Step 300
300
#ABC6CF
oklch(80.9% 0.032 219.9)
-
Step 400
400
#7DA9B7
oklch(70.8% 0.051 219.5)
-
Step 500
500
#5A93A5
oklch(63.1% 0.066 220.1)
-
Step 600
600
#3D7D90
oklch(55.5% 0.072 219.8)
-
Step 700
700
#2E6A7B
oklch(49.2% 0.067 219.2)
-
Step 800
800
#285664
oklch(42.7% 0.055 220.3)
-
Step 900
900 (this color)
#183A44
oklch(32.8% 0.043 219.7)
-
Step 950
950
#172A30
oklch(27.1% 0.027 220)
#183A44 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) | #343845 | 0.037 |
| Deuteranopia (no green cones) | #2D3444 | 0.031 |
| Tritanopia (no blue cones) | #003D3D | 0.025 |
| Achromatopsia (no color) | #363636 | 0.043 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #183A44
#183A44
oklch(32.8% 0.043 219.7)
- #482D24
#482D24
oklch(32.8% 0.043 39.2)
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 #183A44, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Midnight Green #073B4C ΔE 0.017
- Dark Blue Grey #1F3B4D ΔE 0.019
- Gunmetal #293241 ΔE 0.031
- Onyx #343A40 ΔE 0.036
- Prussian Blue #1D3557 ΔE 0.043
- Space Cadet #2B2D42 ΔE 0.047
- Charcoal #264653 ΔE 0.048
- Dark Grey Blue #29465B ΔE 0.056
Use #183A44 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.