#183C47
Closest named color: Dark Blue Grey (#1F3B4D). oklch(33.5% 0.045 220.7), rgb(24, 60, 71).
Aa
White text reads best on this color (11.82:1).
About this color
#183C47 is a dark, muted teal or cyan. In OKLCH its lightness is 33%, its chroma 0.045 and its hue 221°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.015 away. White text reads best on it, at 11.82:1.
| Hue family | Teals and cyans |
| Lightness | dark (33%) |
| Chroma | muted (0.045) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.77:1 |
| White text | 11.82:1 |
Values
| HEX | #183C47 |
| RGB | rgb(24, 60, 71) |
| HSL | hsl(194, 49%, 19%) |
| OKLCH | oklch(33.5% 0.045 220.7) |
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 #183C47 | 11.82:1 | AAA | Lc -100.6 | Preferred for body text |
| Black text on #183C47 | 1.77:1 | Fails | Lc 0.0 | Not readable |
| #183C47 text on white | 11.82:1 | AAA | Lc 97.0 | Preferred for body text |
| #183C47 text on black | 1.77:1 | 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
#E3EBEE
oklch(93.5% 0.009 222.1)
-
Step 200
200
#CCDCE2
oklch(88.4% 0.019 222.2)
-
Step 300
300
#A9C6D0
oklch(80.8% 0.034 220.6)
-
Step 400
400
#7BA9B9
oklch(70.7% 0.054 221.4)
-
Step 500
500
#5793A7
oklch(63% 0.069 221.4)
-
Step 600
600
#397D92
oklch(55.5% 0.075 221)
-
Step 700
700
#2B6A7D
oklch(49.2% 0.07 220.9)
-
Step 800
800
#255665
oklch(42.6% 0.058 220.8)
-
Step 900
900 (this color)
#183C47
oklch(33.5% 0.045 220.7)
-
Step 950
950
#162A30
oklch(27.1% 0.028 219)
#183C47 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) | #353A48 | 0.037 |
| Deuteranopia (no green cones) | #2F3547 | 0.035 |
| Tritanopia (no blue cones) | #00403F | 0.027 |
| Achromatopsia (no color) | #373737 | 0.045 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #183C47
#183C47
oklch(33.5% 0.045 220.7)
- #4B2F24
#4B2F24
oklch(33.6% 0.045 42.2)
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 #183C47, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.015
- Midnight Green #073B4C ΔE 0.015
- Gunmetal #293241 ΔE 0.035
- Onyx #343A40 ΔE 0.036
- Charcoal #264653 ΔE 0.041
- Prussian Blue #1D3557 ΔE 0.042
- Dark Grey Blue #29465B ΔE 0.049
- Space Cadet #2B2D42 ΔE 0.051
Use #183C47 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.