#183B56
Closest named color: Dark Blue Grey (#1F3B4D). oklch(34% 0.062 244.5), rgb(24, 59, 86).
Aa
White text reads best on this color (11.67:1).
About this color
#183B56 is a dark, muted blue. In OKLCH its lightness is 34%, its chroma 0.062 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.017 away. White text reads best on it, at 11.67:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | muted (0.062) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.79:1 |
| White text | 11.67:1 |
Values
| HEX | #183B56 |
| RGB | rgb(24, 59, 86) |
| HSL | hsl(206, 56%, 22%) |
| OKLCH | oklch(34% 0.062 244.5) |
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 #183B56 | 11.67:1 | AAA | Lc -100.3 | Preferred for body text |
| Black text on #183B56 | 1.79:1 | Fails | Lc 0.0 | Not readable |
| #183B56 text on white | 11.67:1 | AAA | Lc 96.6 | Preferred for body text |
| #183B56 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF2
oklch(93.6% 0.013 244.3)
-
Step 200
200
#CBDBEA
oklch(88.4% 0.027 246.4)
-
Step 300
300
#A8C5DD
oklch(81% 0.046 243.3)
-
Step 400
400
#78A6CD
oklch(70.7% 0.076 244.7)
-
Step 500
500
#548FBF
oklch(63% 0.095 244.7)
-
Step 600
600
#3679AC
oklch(55.6% 0.104 244.4)
-
Step 700
700
#286694
oklch(49.2% 0.097 244.2)
-
Step 800
800
#235378
oklch(42.7% 0.081 244.7)
-
Step 900
900 (this color)
#183B56
oklch(34% 0.062 244.5)
-
Step 950
950
#152838
oklch(26.9% 0.039 245.4)
#183B56 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) | #2F3C57 | 0.028 |
| Deuteranopia (no green cones) | #263655 | 0.020 |
| Tritanopia (no blue cones) | #004244 | 0.048 |
| Achromatopsia (no color) | #383838 | 0.062 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #183B56
#183B56
oklch(34% 0.062 244.5)
- #4E3011
#4E3011
oklch(33.9% 0.062 63.6)
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 #183B56, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.017
- Prussian Blue #1D3557 ΔE 0.020
- Midnight Green #073B4C ΔE 0.023
- Marine Blue #01386A ΔE 0.041
- Dark Grey Blue #29465B ΔE 0.042
- Gunmetal #293241 ΔE 0.043
- Charcoal #264653 ΔE 0.043
- Onyx #343A40 ΔE 0.049
Use #183B56 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.