#181E37
Closest named color: Dark (#1B2431). oklch(24.3% 0.049 272.1), rgb(24, 30, 55).
Aa
White text reads best on this color (16.40:1).
About this color
#181E37 is a very dark, muted blue. In OKLCH its lightness is 24%, its chroma 0.049 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Dark (#1B2431), ΔE 0.027 away. White text reads best on it, at 16.40:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | muted (0.049) |
| Temperature | cool |
| Nearest name | Dark (#1B2431) |
| Black text | 1.27:1 |
| White text | 16.40:1 |
Values
| HEX | #181E37 |
| RGB | rgb(24, 30, 55) |
| HSL | hsl(228, 39%, 15%) |
| OKLCH | oklch(24.3% 0.049 272.1) |
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 #181E37 | 16.40:1 | AAA | Lc -105.8 | Preferred for body text |
| Black text on #181E37 | 1.27:1 | Fails | Lc 0.0 | Not readable |
| #181E37 text on white | 16.40:1 | AAA | Lc 103.3 | Preferred for body text |
| #181E37 text on black | 1.27:1 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E6E9F5
oklch(93.5% 0.016 274.8)
-
Step 200
200
#D1D8EF
oklch(88.4% 0.033 272.2)
-
Step 300
300
#B3BFE7
oklch(80.9% 0.058 272)
-
Step 400
400
#8C9DDB
oklch(70.7% 0.093 272.1)
-
Step 500
500
#7184D1
oklch(63.2% 0.118 272.1)
-
Step 600
600
#5A6CBE
oklch(55.6% 0.129 272.3)
-
Step 700
700
#4A5AA4
oklch(49.1% 0.12 272.1)
-
Step 800
800
#3D4A84
oklch(42.7% 0.097 272.2)
-
Step 900
900
#343E6A
oklch(37.7% 0.076 272.6)
-
Step 950
950 (this color)
#181E37
oklch(24.3% 0.049 272.1)
#181E37 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) | #142138 | 0.011 |
| Deuteranopia (no green cones) | #111E36 | 0.011 |
| Tritanopia (no blue cones) | #0C2327 | 0.043 |
| Achromatopsia (no color) | #1F1F1F | 0.049 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #181E37
#181E37
oklch(24.3% 0.049 272.1)
- #281F01
#281F01
oklch(24.3% 0.048 92.6)
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 #181E37, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark #1B2431 ΔE 0.027
- Oxford Blue #1B263B ΔE 0.028
- Rich Black #0D1B2A ΔE 0.032
- Jet #212529 ΔE 0.044
- Space Cadet #2B2D42 ΔE 0.063
- Navy Blue #001146 ΔE 0.064
- Gunmetal #293241 ΔE 0.075
- Dark Indigo #1F0954 ΔE 0.076
Use #181E37 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.