#183A37
Closest named color: Midnight Green (#073B4C). oklch(32.2% 0.04 187.8), rgb(24, 58, 55).
Aa
White text reads best on this color (12.35:1).
About this color
#183A37 is a dark, muted teal or cyan. In OKLCH its lightness is 32%, its chroma 0.040 and its hue 188°. Its hue sits on the cool side of the wheel. The nearest named color is Midnight Green (#073B4C), ΔE 0.037 away. White text reads best on it, at 12.35:1.
| Hue family | Teals and cyans |
| Lightness | dark (32%) |
| Chroma | muted (0.040) |
| Temperature | cool |
| Nearest name | Midnight Green (#073B4C) |
| Black text | 1.69:1 |
| White text | 12.35:1 |
Values
| HEX | #183A37 |
| RGB | rgb(24, 58, 55) |
| HSL | hsl(175, 41%, 16%) |
| OKLCH | oklch(32.2% 0.04 187.8) |
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 #183A37 | 12.35:1 | AAA | Lc -101.5 | Preferred for body text |
| Black text on #183A37 | 1.69:1 | Fails | Lc 0.0 | Not readable |
| #183A37 text on white | 12.35:1 | AAA | Lc 98.0 | Preferred for body text |
| #183A37 text on black | 1.69:1 | 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 950.
-
Step 50
50
#F1F7F6
oklch(97.1% 0.006 185.3)
-
Step 100
100
#E0EDEB
oklch(93.6% 0.014 185.9)
-
Step 200
200
#C7DFDC
oklch(88.5% 0.026 187.6)
-
Step 300
300
#9ECBC6
oklch(80.9% 0.048 187.9)
-
Step 400
400
#65B0A9
oklch(70.7% 0.076 187.9)
-
Step 500
500
#2F9C94
oklch(63.1% 0.097 187.9)
-
Step 600
600
#00857E
oklch(55.6% 0.097 188.3)
-
Step 700
700
#007069
oklch(49.1% 0.086 187.3)
-
Step 800
800
#005C56
oklch(42.8% 0.075 187.1)
-
Step 900
900
#064C48
oklch(37.7% 0.063 188.6)
-
Step 950
950 (this color)
#183A37
oklch(32.2% 0.04 187.8)
#183A37 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) | #373737 | 0.043 |
| Deuteranopia (no green cones) | #313337 | 0.039 |
| Tritanopia (no blue cones) | #053B39 | 0.013 |
| Achromatopsia (no color) | #343434 | 0.040 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #183A37
#183A37
oklch(32.2% 0.04 187.8)
- #452B2F
#452B2F
oklch(32.2% 0.039 9.4)
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 #183A37, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Midnight Green #073B4C ΔE 0.037
- Dark Blue Grey #1F3B4D ΔE 0.041
- Onyx #343A40 ΔE 0.042
- Gunmetal #293241 ΔE 0.043
- Pakistan Green #283618 ΔE 0.048
- Evergreen #05472A ΔE 0.058
- Space Cadet #2B2D42 ΔE 0.059
- Charcoal Grey #3C4142 ΔE 0.059
Use #183A37 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.