#183143
Closest named color: Gunmetal (#293241). oklch(30.2% 0.045 241.7), rgb(24, 49, 67).
Aa
White text reads best on this color (13.46:1).
About this color
#183143 is a dark, muted blue. In OKLCH its lightness is 30%, its chroma 0.045 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Gunmetal (#293241), ΔE 0.024 away. White text reads best on it, at 13.46:1.
| Hue family | Blues |
| Lightness | dark (30%) |
| Chroma | muted (0.045) |
| Temperature | cool |
| Nearest name | Gunmetal (#293241) |
| Black text | 1.55:1 |
| White text | 13.46:1 |
Values
| HEX | #183143 |
| RGB | rgb(24, 49, 67) |
| HSL | hsl(205, 47%, 18%) |
| OKLCH | oklch(30.2% 0.045 241.7) |
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 #183143 | 13.46:1 | AAA | Lc -103.0 | Preferred for body text |
| Black text on #183143 | 1.55:1 | Fails | Lc 0.0 | Not readable |
| #183143 text on white | 13.46:1 | AAA | Lc 99.8 | Preferred for body text |
| #183143 text on black | 1.55:1 | 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
#E1EBF3
oklch(93.5% 0.015 241.8)
-
Step 200
200
#C9DCEB
oklch(88.5% 0.029 241.6)
-
Step 300
300
#A3C6E1
oklch(81% 0.054 241.5)
-
Step 400
400
#6FA7D1
oklch(70.6% 0.085 241.9)
-
Step 500
500
#4591C6
oklch(63.1% 0.11 241.8)
-
Step 600
600
#1F7AB2
oklch(55.5% 0.119 241.7)
-
Step 700
700
#0F6799
oklch(49.2% 0.11 241.3)
-
Step 800
800
#12547C
oklch(42.7% 0.091 241.4)
-
Step 900
900
#184664
oklch(37.8% 0.071 241.1)
-
Step 950
950 (this color)
#183143
oklch(30.2% 0.045 241.7)
#183143 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) | #293144 | 0.023 |
| Deuteranopia (no green cones) | #232D43 | 0.018 |
| Tritanopia (no blue cones) | #003537 | 0.036 |
| Achromatopsia (no color) | #2F2F2F | 0.045 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #183143
#183143
oklch(30.2% 0.045 241.7)
- #3F2915
#3F2915
oklch(30.3% 0.046 62)
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 #183143, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Gunmetal #293241 ΔE 0.024
- Space Cadet #2B2D42 ΔE 0.028
- Midnight Green #073B4C ΔE 0.034
- Oxford Blue #1B263B ΔE 0.037
- Dark Blue Grey #1F3B4D ΔE 0.037
- Prussian Blue #1D3557 ΔE 0.037
- Dark #1B2431 ΔE 0.048
- Jet #212529 ΔE 0.054
Use #183143 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.