#181E3C
Closest named color: Oxford Blue (#1B263B). oklch(24.7% 0.057 273), rgb(24, 30, 60).
Aa
White text reads best on this color (16.28:1).
About this color
#181E3C is a very dark, muted blue. In OKLCH its lightness is 25%, its chroma 0.057 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.029 away. White text reads best on it, at 16.28:1.
| Hue family | Blues |
| Lightness | very dark (25%) |
| Chroma | muted (0.057) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.28:1 |
| White text | 16.28:1 |
Values
| HEX | #181E3C |
| RGB | rgb(24, 30, 60) |
| HSL | hsl(230, 43%, 16%) |
| OKLCH | oklch(24.7% 0.057 273) |
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 #181E3C | 16.28:1 | AAA | Lc -105.7 | Preferred for body text |
| Black text on #181E3C | 1.28:1 | Fails | Lc 0.0 | Not readable |
| #181E3C text on white | 16.28:1 | AAA | Lc 103.2 | Preferred for body text |
| #181E3C text on black | 1.28:1 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E5E9F8
oklch(93.5% 0.021 274)
-
Step 200
200
#D0D8F3
oklch(88.5% 0.038 272.5)
-
Step 300
300
#B2BEED
oklch(80.8% 0.068 273.6)
-
Step 400
400
#8A9CE5
oklch(70.8% 0.109 272.8)
-
Step 500
500
#6E81DD
oklch(63% 0.14 273)
-
Step 600
600
#5869CB
oklch(55.7% 0.152 273.1)
-
Step 700
700
#4857AF
oklch(49.1% 0.14 272.9)
-
Step 800
800
#3B478E
oklch(42.6% 0.117 273.2)
-
Step 900
900
#323C71
oklch(37.6% 0.091 273.2)
-
Step 950
950 (this color)
#181E3C
oklch(24.7% 0.057 273)
#181E3C 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) | #11223D | 0.015 |
| Deuteranopia (no green cones) | #0E1F3B | 0.014 |
| Tritanopia (no blue cones) | #08242A | 0.049 |
| Achromatopsia (no color) | #202020 | 0.058 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #181E3C
#181E3C
oklch(24.7% 0.057 273)
- #292000
#292000
oklch(24.7% 0.051 93.6)
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 #181E3C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.029
- Dark #1B2431 ΔE 0.033
- Rich Black #0D1B2A ΔE 0.040
- Jet #212529 ΔE 0.051
- Navy Blue #001146 ΔE 0.059
- Space Cadet #2B2D42 ΔE 0.062
- Dark Indigo #1F0954 ΔE 0.067
- Gunmetal #293241 ΔE 0.075
Use #181E3C 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.