#183243
Closest named color: Gunmetal (#293241). oklch(30.5% 0.044 239.2), rgb(24, 50, 67).
Aa
White text reads best on this color (13.32:1).
About this color
#183243 is a dark, muted blue. In OKLCH its lightness is 30%, its chroma 0.044 and its hue 239°. Its hue sits on the cool side of the wheel. The nearest named color is Gunmetal (#293241), ΔE 0.023 away. White text reads best on it, at 13.32:1.
| Hue family | Blues |
| Lightness | dark (30%) |
| Chroma | muted (0.044) |
| Temperature | cool |
| Nearest name | Gunmetal (#293241) |
| Black text | 1.57:1 |
| White text | 13.32:1 |
Values
| HEX | #183243 |
| RGB | rgb(24, 50, 67) |
| HSL | hsl(204, 47%, 18%) |
| OKLCH | oklch(30.5% 0.044 239.2) |
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 #183243 | 13.32:1 | AAA | Lc -102.8 | Preferred for body text |
| Black text on #183243 | 1.57:1 | Fails | Lc 0.0 | Not readable |
| #183243 text on white | 13.32:1 | AAA | Lc 99.6 | Preferred for body text |
| #183243 text on black | 1.57:1 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1ECF3
oklch(93.7% 0.015 235.4)
-
Step 200
200
#C8DCEB
oklch(88.4% 0.03 240.2)
-
Step 300
300
#A2C6DF
oklch(80.9% 0.052 238.6)
-
Step 400
400
#6EA8D0
oklch(70.7% 0.084 239.7)
-
Step 500
500
#4292C3
oklch(63.1% 0.107 238.7)
-
Step 600
600
#1A7BB0
oklch(55.6% 0.117 239.3)
-
Step 700
700
#066897
oklch(49.2% 0.108 238.6)
-
Step 800
800
#0E557B
oklch(42.8% 0.09 239)
-
Step 900
900
#174663
oklch(37.7% 0.071 239.8)
-
Step 950
950 (this color)
#183243
oklch(30.5% 0.044 239.2)
#183243 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) | #2A3244 | 0.024 |
| Deuteranopia (no green cones) | #242D43 | 0.021 |
| Tritanopia (no blue cones) | #003638 | 0.034 |
| Achromatopsia (no color) | #2F2F2F | 0.044 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #183243
#183243
oklch(30.5% 0.044 239.2)
- #402917
#402917
oklch(30.5% 0.045 58.1)
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 #183243, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Gunmetal #293241 ΔE 0.023
- Space Cadet #2B2D42 ΔE 0.029
- Midnight Green #073B4C ΔE 0.031
- Dark Blue Grey #1F3B4D ΔE 0.034
- Prussian Blue #1D3557 ΔE 0.037
- Oxford Blue #1B263B ΔE 0.040
- Dark #1B2431 ΔE 0.051
- Onyx #343A40 ΔE 0.051
Use #183243 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.