#183D47
Closest named color: Dark Blue Grey (#1F3B4D). oklch(33.8% 0.045 218.2), rgb(24, 61, 71).
Aa
White text reads best on this color (11.68:1).
About this color
#183D47 is a dark, muted teal or cyan. In OKLCH its lightness is 34%, its chroma 0.045 and its hue 218°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.016 away. White text reads best on it, at 11.68:1.
| Hue family | Teals and cyans |
| Lightness | dark (34%) |
| Chroma | muted (0.045) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.79:1 |
| White text | 11.68:1 |
Values
| HEX | #183D47 |
| RGB | rgb(24, 61, 71) |
| HSL | hsl(193, 49%, 19%) |
| OKLCH | oklch(33.8% 0.045 218.2) |
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 #183D47 | 11.68:1 | AAA | Lc -100.4 | Preferred for body text |
| Black text on #183D47 | 1.79:1 | Fails | Lc 0.0 | Not readable |
| #183D47 text on white | 11.68:1 | AAA | Lc 96.7 | Preferred for body text |
| #183D47 text on black | 1.79:1 | 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
#E3ECEE
oklch(93.7% 0.01 212.5)
-
Step 200
200
#CCDCE1
oklch(88.4% 0.019 218.4)
-
Step 300
300
#A9C6CF
oklch(80.8% 0.034 218.5)
-
Step 400
400
#7AA9B7
oklch(70.6% 0.054 218.2)
-
Step 500
500
#5694A6
oklch(63.2% 0.069 218.6)
-
Step 600
600
#387E91
oklch(55.6% 0.075 218.3)
-
Step 700
700
#296A7B
oklch(49% 0.07 218.1)
-
Step 800
800
#245764
oklch(42.8% 0.058 217.1)
-
Step 900
900 (this color)
#183D47
oklch(33.8% 0.045 218.2)
-
Step 950
950
#152A30
oklch(27% 0.029 218.2)
#183D47 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) | #373B48 | 0.040 |
| Deuteranopia (no green cones) | #303647 | 0.036 |
| Tritanopia (no blue cones) | #004040 | 0.024 |
| Achromatopsia (no color) | #383838 | 0.045 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #183D47
#183D47
oklch(33.8% 0.045 218.2)
- #4C2F26
#4C2F26
oklch(33.8% 0.046 38)
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 #183D47, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.016
- Midnight Green #073B4C ΔE 0.017
- Onyx #343A40 ΔE 0.035
- Charcoal #264653 ΔE 0.038
- Gunmetal #293241 ΔE 0.038
- Prussian Blue #1D3557 ΔE 0.045
- Dark Grey Blue #29465B ΔE 0.047
- Charcoal Grey #3C4142 ΔE 0.051
Use #183D47 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.