#181E33
Closest named color: Dark (#1B2431). oklch(24% 0.041 270.9), rgb(24, 30, 51).
Aa
White text reads best on this color (16.50:1).
About this color
#181E33 is a very dark, muted blue. In OKLCH its lightness is 24%, its chroma 0.041 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Dark (#1B2431), ΔE 0.024 away. White text reads best on it, at 16.50:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | muted (0.041) |
| Temperature | cool |
| Nearest name | Dark (#1B2431) |
| Black text | 1.27:1 |
| White text | 16.50:1 |
Values
| HEX | #181E33 |
| RGB | rgb(24, 30, 51) |
| HSL | hsl(227, 36%, 15%) |
| OKLCH | oklch(24% 0.041 270.9) |
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 #181E33 | 16.50:1 | AAA | Lc -105.9 | Preferred for body text |
| Black text on #181E33 | 1.27:1 | Fails | Lc 0.0 | Not readable |
| #181E33 text on white | 16.50:1 | AAA | Lc 103.4 | Preferred for body text |
| #181E33 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E6EAF4
oklch(93.7% 0.014 268.5)
-
Step 200
200
#D2D9EC
oklch(88.6% 0.027 269.6)
-
Step 300
300
#B5C0E1
oklch(81% 0.048 270.8)
-
Step 400
400
#8E9ED2
oklch(70.6% 0.079 271.1)
-
Step 500
500
#7386C6
oklch(63.1% 0.099 270.7)
-
Step 600
600
#5C6FB3
oklch(55.7% 0.108 270.8)
-
Step 700
700
#4C5C9A
oklch(49.1% 0.101 271.3)
-
Step 800
800
#3E4C7D
oklch(42.8% 0.083 270.5)
-
Step 900
900
#353F64
oklch(37.6% 0.065 271.5)
-
Step 950
950 (this color)
#181E33
oklch(24% 0.041 270.9)
#181E33 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) | #162034 | 0.007 |
| Deuteranopia (no green cones) | #141E33 | 0.006 |
| Tritanopia (no blue cones) | #0E2226 | 0.036 |
| Achromatopsia (no color) | #1F1F1F | 0.041 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #181E33
#181E33
oklch(24% 0.041 270.9)
- #271E05
#271E05
oklch(24% 0.042 89.4)
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 #181E33, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark #1B2431 ΔE 0.024
- Rich Black #0D1B2A ΔE 0.027
- Oxford Blue #1B263B ΔE 0.029
- Jet #212529 ΔE 0.039
- Space Cadet #2B2D42 ΔE 0.065
- Navy Blue #001146 ΔE 0.068
- Gunmetal #293241 ΔE 0.076
- Rich Navy #001219 ΔE 0.078
Use #181E33 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.