#183B3F
Closest named color: Midnight Green (#073B4C). oklch(32.8% 0.041 205.3), rgb(24, 59, 63).
Aa
White text reads best on this color (12.09:1).
About this color
#183B3F is a dark, muted teal or cyan. In OKLCH its lightness is 33%, its chroma 0.041 and its hue 205°. Its hue sits on the cool side of the wheel. The nearest named color is Midnight Green (#073B4C), ΔE 0.025 away. White text reads best on it, at 12.09:1.
| Hue family | Teals and cyans |
| Lightness | dark (33%) |
| Chroma | muted (0.041) |
| Temperature | cool |
| Nearest name | Midnight Green (#073B4C) |
| Black text | 1.73:1 |
| White text | 12.09:1 |
Values
| HEX | #183B3F |
| RGB | rgb(24, 59, 63) |
| HSL | hsl(186, 45%, 17%) |
| OKLCH | oklch(32.8% 0.041 205.3) |
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 #183B3F | 12.09:1 | AAA | Lc -101.1 | Preferred for body text |
| Black text on #183B3F | 1.73:1 | Fails | Lc 0.0 | Not readable |
| #183B3F text on white | 12.09:1 | AAA | Lc 97.5 | Preferred for body text |
| #183B3F text on black | 1.73:1 | 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
#CDDDDE
oklch(88.6% 0.017 201.4)
-
Step 300
300
#ABC7CA
oklch(81% 0.03 204.5)
-
Step 400
400
#7DAAAF
oklch(70.7% 0.049 204.7)
-
Step 500
500
#59959C
oklch(63.2% 0.063 205.2)
-
Step 600
600
#3D7F86
oklch(55.6% 0.068 204.6)
-
Step 700
700
#2E6B72
oklch(49.1% 0.063 205.5)
-
Step 800
800
#28575D
oklch(42.7% 0.052 206.4)
-
Step 900
900 (this color)
#183B3F
oklch(32.8% 0.041 205.3)
-
Step 950
950
#172A2C
oklch(27% 0.025 204.3)
#183B3F 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) | #36393F | 0.040 |
| Deuteranopia (no green cones) | #30343F | 0.037 |
| Tritanopia (no blue cones) | #003D3C | 0.018 |
| Achromatopsia (no color) | #363636 | 0.041 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #183B3F
#183B3F
oklch(32.8% 0.041 205.3)
- #482D2A
#482D2A
oklch(32.9% 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 #183B3F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Midnight Green #073B4C ΔE 0.025
- Dark Blue Grey #1F3B4D ΔE 0.027
- Onyx #343A40 ΔE 0.036
- Gunmetal #293241 ΔE 0.036
- Charcoal #264653 ΔE 0.049
- Space Cadet #2B2D42 ΔE 0.053
- Prussian Blue #1D3557 ΔE 0.053
- Charcoal Grey #3C4142 ΔE 0.054
Use #183B3F 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.