#183A48
Closest named color: Midnight Green (#073B4C). oklch(33% 0.046 227.7), rgb(24, 58, 72).
Aa
White text reads best on this color (12.08:1).
About this color
#183A48 is a dark, muted teal or cyan. In OKLCH its lightness is 33%, its chroma 0.046 and its hue 228°. Its hue sits on the cool side of the wheel. The nearest named color is Midnight Green (#073B4C), ΔE 0.012 away. White text reads best on it, at 12.08:1.
| Hue family | Teals and cyans |
| Lightness | dark (33%) |
| Chroma | muted (0.046) |
| Temperature | cool |
| Nearest name | Midnight Green (#073B4C) |
| Black text | 1.73:1 |
| White text | 12.08:1 |
Values
| HEX | #183A48 |
| RGB | rgb(24, 58, 72) |
| HSL | hsl(197, 50%, 19%) |
| OKLCH | oklch(33% 0.046 227.7) |
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 #183A48 | 12.08:1 | AAA | Lc -101.0 | Preferred for body text |
| Black text on #183A48 | 1.73:1 | Fails | Lc 0.0 | Not readable |
| #183A48 text on white | 12.08:1 | AAA | Lc 97.5 | Preferred for body text |
| #183A48 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E3EBEF
oklch(93.5% 0.01 228.9)
-
Step 200
200
#CDDCE3
oklch(88.5% 0.019 227.3)
-
Step 300
300
#AAC6D2
oklch(81% 0.035 225.6)
-
Step 400
400
#7CA8BC
oklch(70.7% 0.056 227.7)
-
Step 500
500
#5992AB
oklch(63% 0.071 227.9)
-
Step 600
600
#3C7C97
oklch(55.5% 0.078 228.2)
-
Step 700
700
#2E6981
oklch(49.2% 0.072 227.7)
-
Step 800
800
#275569
oklch(42.6% 0.06 228.9)
-
Step 900
900 (this color)
#183A48
oklch(33% 0.046 227.7)
-
Step 950
950
#162932
oklch(26.9% 0.03 229.7)
#183A48 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) | #333949 | 0.035 |
| Deuteranopia (no green cones) | #2C3448 | 0.030 |
| Tritanopia (no blue cones) | #003E3F | 0.029 |
| Achromatopsia (no color) | #363636 | 0.047 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #183A48
#183A48
oklch(33% 0.046 227.7)
- #492E20
#492E20
oklch(33% 0.046 48)
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 #183A48, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Midnight Green #073B4C ΔE 0.012
- Dark Blue Grey #1F3B4D ΔE 0.012
- Gunmetal #293241 ΔE 0.030
- Prussian Blue #1D3557 ΔE 0.036
- Onyx #343A40 ΔE 0.038
- Space Cadet #2B2D42 ΔE 0.045
- Charcoal #264653 ΔE 0.046
- Dark Grey Blue #29465B ΔE 0.052
Use #183A48 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.