#183E4D
Closest named color: Dark Blue Grey (#1F3B4D). oklch(34.4% 0.05 227), rgb(24, 62, 77).
Aa
White text reads best on this color (11.44:1).
About this color
#183E4D is a dark, muted teal or cyan. In OKLCH its lightness is 34%, its chroma 0.050 and its hue 227°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.011 away. White text reads best on it, at 11.44:1.
| Hue family | Teals and cyans |
| Lightness | dark (34%) |
| Chroma | muted (0.050) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.83:1 |
| White text | 11.44:1 |
Values
| HEX | #183E4D |
| RGB | rgb(24, 62, 77) |
| HSL | hsl(197, 52%, 20%) |
| OKLCH | oklch(34.4% 0.05 227) |
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 #183E4D | 11.44:1 | AAA | Lc -99.9 | Preferred for body text |
| Black text on #183E4D | 1.83:1 | Fails | Lc 7.7 | Not readable |
| #183E4D text on white | 11.44:1 | AAA | Lc 96.2 | Preferred for body text |
| #183E4D text on black | 1.83:1 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E3EBEF
oklch(93.5% 0.01 228.9)
-
Step 200
200
#CCDCE4
oklch(88.5% 0.02 229.1)
-
Step 300
300
#A8C6D4
oklch(80.9% 0.038 227.7)
-
Step 400
400
#78A9BE
oklch(70.8% 0.06 226.5)
-
Step 500
500
#5393AE
oklch(63.1% 0.077 227.3)
-
Step 600
600
#357D99
oklch(55.6% 0.083 226.9)
-
Step 700
700
#266983
oklch(49% 0.078 227.5)
-
Step 800
800
#22566A
oklch(42.7% 0.064 226.6)
-
Step 900
900 (this color)
#183E4D
oklch(34.4% 0.05 227)
-
Step 950
950
#142A32
oklch(27.1% 0.032 223.6)
#183E4D 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) | #363D4E | 0.037 |
| Deuteranopia (no green cones) | #2F374D | 0.034 |
| Tritanopia (no blue cones) | #004243 | 0.030 |
| Achromatopsia (no color) | #3A3A3A | 0.050 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #183E4D
#183E4D
oklch(34.4% 0.05 227)
- #4E3122
#4E3122
oklch(34.4% 0.049 47.9)
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 #183E4D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.011
- Midnight Green #073B4C ΔE 0.017
- Charcoal #264653 ΔE 0.032
- Onyx #343A40 ΔE 0.038
- Prussian Blue #1D3557 ΔE 0.039
- Dark Grey Blue #29465B ΔE 0.039
- Gunmetal #293241 ΔE 0.041
- Dark Teal #014D4E ΔE 0.050
Use #183E4D 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.