#183D3D
Closest named color: Midnight Green (#073B4C). oklch(33.3% 0.042 195.3), rgb(24, 61, 61).
Aa
White text reads best on this color (11.83:1).
About this color
#183D3D is a dark, muted teal or cyan. In OKLCH its lightness is 33%, its chroma 0.042 and its hue 195°. Its hue sits on the cool side of the wheel. The nearest named color is Midnight Green (#073B4C), ΔE 0.031 away. White text reads best on it, at 11.83:1.
| Hue family | Teals and cyans |
| Lightness | dark (33%) |
| Chroma | muted (0.042) |
| Temperature | cool |
| Nearest name | Midnight Green (#073B4C) |
| Black text | 1.77:1 |
| White text | 11.83:1 |
Values
| HEX | #183D3D |
| RGB | rgb(24, 61, 61) |
| HSL | hsl(180, 44%, 17%) |
| OKLCH | oklch(33.3% 0.042 195.3) |
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 #183D3D | 11.83:1 | AAA | Lc -100.6 | Preferred for body text |
| Black text on #183D3D | 1.77:1 | Fails | Lc 0.0 | Not readable |
| #183D3D text on white | 11.83:1 | AAA | Lc 97.0 | Preferred for body text |
| #183D3D text on black | 1.77:1 | 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
#F2F6F6
oklch(97% 0.004 197.1)
-
Step 100
100
#E3ECEC
oklch(93.6% 0.01 197)
-
Step 200
200
#CDDDDD
oklch(88.6% 0.017 196.8)
-
Step 300
300
#AAC7C7
oklch(80.8% 0.031 196.6)
-
Step 400
400
#7BABAA
oklch(70.7% 0.051 194.4)
-
Step 500
500
#589696
oklch(63.1% 0.064 195.6)
-
Step 600
600
#3A8080
oklch(55.5% 0.07 195.3)
-
Step 700
700
#2C6C6C
oklch(49% 0.065 195.2)
-
Step 800
800
#265858
oklch(42.6% 0.054 195.3)
-
Step 900
900 (this color)
#183D3D
oklch(33.3% 0.042 195.3)
-
Step 950
950
#162B2A
oklch(27.1% 0.027 191.8)
#183D3D 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) | #393A3D | 0.044 |
| Deuteranopia (no green cones) | #33353D | 0.042 |
| Tritanopia (no blue cones) | #003F3D | 0.015 |
| Achromatopsia (no color) | #373737 | 0.042 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #183D3D
#183D3D
oklch(33.3% 0.042 195.3)
- #4A2D2F
#4A2D2F
oklch(33.4% 0.043 15.1)
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 #183D3D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Midnight Green #073B4C ΔE 0.031
- Dark Blue Grey #1F3B4D ΔE 0.033
- Onyx #343A40 ΔE 0.038
- Gunmetal #293241 ΔE 0.044
- Charcoal #264653 ΔE 0.048
- Charcoal Grey #3C4142 ΔE 0.052
- Dark Teal #014D4E ΔE 0.053
- Evergreen #05472A ΔE 0.056
Use #183D3D 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.