#183B33
Closest named color: Pakistan Green (#283618). oklch(32.4% 0.043 176.4), rgb(24, 59, 51).
Aa
White text reads best on this color (12.26:1).
About this color
#183B33 is a dark, muted teal or cyan. In OKLCH its lightness is 32%, its chroma 0.043 and its hue 176°. Its hue sits on the cool side of the wheel. The nearest named color is Pakistan Green (#283618), ΔE 0.041 away. White text reads best on it, at 12.26:1.
| Hue family | Teals and cyans |
| Lightness | dark (32%) |
| Chroma | muted (0.043) |
| Temperature | cool |
| Nearest name | Pakistan Green (#283618) |
| Black text | 1.71:1 |
| White text | 12.26:1 |
Values
| HEX | #183B33 |
| RGB | rgb(24, 59, 51) |
| HSL | hsl(166, 42%, 16%) |
| OKLCH | oklch(32.4% 0.043 176.4) |
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 #183B33 | 12.26:1 | AAA | Lc -101.3 | Preferred for body text |
| Black text on #183B33 | 1.71:1 | Fails | Lc 0.0 | Not readable |
| #183B33 text on white | 12.26:1 | AAA | Lc 97.8 | Preferred for body text |
| #183B33 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
#F3F6F5
oklch(97.1% 0.003 174.5)
-
Step 100
100
#E4ECE9
oklch(93.6% 0.009 171.8)
-
Step 200
200
#CDDDD9
oklch(88.4% 0.018 179.3)
-
Step 300
300
#ACC8C0
oklch(81% 0.032 176.4)
-
Step 400
400
#7EAC9F
oklch(70.8% 0.053 175.4)
-
Step 500
500
#5B9788
oklch(63.1% 0.067 176.3)
-
Step 600
600
#3F8172
oklch(55.5% 0.072 176.7)
-
Step 700
700
#316D5F
oklch(49% 0.067 176)
-
Step 800
800
#29594E
oklch(42.7% 0.056 176.5)
-
Step 900
900 (this color)
#183B33
oklch(32.4% 0.043 176.4)
-
Step 950
950
#172B26
oklch(27% 0.028 176.4)
#183B33 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) | #393733 | 0.046 |
| Deuteranopia (no green cones) | #333334 | 0.044 |
| Tritanopia (no blue cones) | #073C39 | 0.014 |
| Achromatopsia (no color) | #353535 | 0.044 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #183B33
#183B33
oklch(32.4% 0.043 176.4)
- #462A34
#462A34
oklch(32.3% 0.044 356.9)
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 #183B33, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Pakistan Green #283618 ΔE 0.041
- Midnight Green #073B4C ΔE 0.045
- Onyx #343A40 ΔE 0.046
- Dark Blue Grey #1F3B4D ΔE 0.049
- Evergreen #05472A ΔE 0.050
- Gunmetal #293241 ΔE 0.051
- Charcoal Grey #3C4142 ΔE 0.061
- Charcoal #264653 ΔE 0.063
Use #183B33 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.