#181F5E
Closest named color: Midnight Blue (#191970). oklch(27.9% 0.111 272.1), rgb(24, 31, 94).
Aa
White text reads best on this color (15.03:1).
About this color
#181F5E is a dark, moderately saturated blue. In OKLCH its lightness is 28%, its chroma 0.111 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Midnight Blue (#191970), ΔE 0.034 away. White text reads best on it, at 15.03:1.
| Hue family | Blues |
| Lightness | dark (28%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Midnight Blue (#191970) |
| Black text | 1.39:1 |
| White text | 15.03:1 |
Values
| HEX | #181F5E |
| RGB | rgb(24, 31, 94) |
| HSL | hsl(234, 59%, 23%) |
| OKLCH | oklch(27.9% 0.111 272.1) |
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 #181F5E | 15.03:1 | AAA | Lc -104.4 | Preferred for body text |
| Black text on #181F5E | 1.39:1 | Fails | Lc 0.0 | Not readable |
| #181F5E text on white | 15.03:1 | AAA | Lc 101.6 | Preferred for body text |
| #181F5E text on black | 1.39:1 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E2E9FF
oklch(93.5% 0.031 271.7)
-
Step 200
200
#CCD8FF
oklch(88.6% 0.055 271.8)
-
Step 300
300
#ABBDFF
oklch(80.9% 0.096 272.3)
-
Step 400
400
#8098FF
oklch(70.7% 0.153 272.1)
-
Step 500
500
#637AFF
oklch(63.2% 0.198 272.1)
-
Step 600
600
#4A56FF
oklch(55.5% 0.246 272.2)
-
Step 700
700
#3B32F6
oklch(49% 0.272 272.1)
-
Step 800
800
#302DC7
oklch(42.7% 0.226 272.2)
-
Step 900
900
#272D9C
oklch(37.6% 0.176 271.9)
-
Step 950
950 (this color)
#181F5E
oklch(27.9% 0.111 272.1)
#181F5E 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) | #002A60 | 0.033 |
| Deuteranopia (no green cones) | #00235D | 0.024 |
| Tritanopia (no blue cones) | #002F3B | 0.089 |
| Achromatopsia (no color) | #262626 | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #181F5E
#181F5E
oklch(27.9% 0.111 272.1)
- #332700
#332700
oklch(27.9% 0.057 91)
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 #181F5E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Midnight Blue #191970 ΔE 0.034
- Marine #042E60 ΔE 0.042
- Dark Indigo #1F0954 ΔE 0.050
- Darkblue #030764 ΔE 0.059
- Dark Royal Blue #02066F ΔE 0.062
- Deep Blue #040273 ΔE 0.066
- Prussian Blue #1D3557 ΔE 0.069
- Oxford Blue #1B263B ΔE 0.070
Use #181F5E 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.