#183A3F
Closest named color: Midnight Green (#073B4C). oklch(32.5% 0.04 208.1), rgb(24, 58, 63).
Aa
White text reads best on this color (12.23:1).
About this color
#183A3F is a dark, muted teal or cyan. In OKLCH its lightness is 33%, its chroma 0.040 and its hue 208°. Its hue sits on the cool side of the wheel. The nearest named color is Midnight Green (#073B4C), ΔE 0.024 away. White text reads best on it, at 12.23:1.
| Hue family | Teals and cyans |
| Lightness | dark (33%) |
| Chroma | muted (0.040) |
| Temperature | cool |
| Nearest name | Midnight Green (#073B4C) |
| Black text | 1.71:1 |
| White text | 12.23:1 |
Values
| HEX | #183A3F |
| RGB | rgb(24, 58, 63) |
| HSL | hsl(188, 45%, 17%) |
| OKLCH | oklch(32.5% 0.04 208.1) |
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 #183A3F | 12.23:1 | AAA | Lc -101.3 | Preferred for body text |
| Black text on #183A3F | 1.71:1 | Fails | Lc 0.0 | Not readable |
| #183A3F text on white | 12.23:1 | AAA | Lc 97.8 | Preferred for body text |
| #183A3F text on black | 1.71:1 | 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
#E4ECED
oklch(93.7% 0.009 205.9)
-
Step 200
200
#CDDCDF
oklch(88.4% 0.017 211)
-
Step 300
300
#ABC6CB
oklch(80.8% 0.03 210.1)
-
Step 400
400
#7DA9B0
oklch(70.6% 0.048 208.3)
-
Step 500
500
#5B949D
oklch(63.1% 0.061 208.5)
-
Step 600
600
#3E7E88
oklch(55.5% 0.067 208.8)
-
Step 700
700
#306B73
oklch(49.2% 0.062 207.2)
-
Step 800
800
#29575E
oklch(42.7% 0.051 208.4)
-
Step 900
900 (this color)
#183A3F
oklch(32.5% 0.04 208.1)
-
Step 950
950
#172A2D
oklch(27% 0.025 208.4)
#183A3F 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) | #35383F | 0.038 |
| Deuteranopia (no green cones) | #2F333F | 0.036 |
| Tritanopia (no blue cones) | #003D3B | 0.021 |
| Achromatopsia (no color) | #353535 | 0.040 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #183A3F
#183A3F
oklch(32.5% 0.04 208.1)
- #472C29
#472C29
oklch(32.5% 0.041 26.5)
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 #183A3F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Midnight Green #073B4C ΔE 0.024
- Dark Blue Grey #1F3B4D ΔE 0.027
- Gunmetal #293241 ΔE 0.034
- Onyx #343A40 ΔE 0.037
- Space Cadet #2B2D42 ΔE 0.050
- Prussian Blue #1D3557 ΔE 0.052
- Charcoal #264653 ΔE 0.052
- Charcoal Grey #3C4142 ΔE 0.056
Use #183A3F 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.