#181F30
Closest named color: Dark (#1B2431). oklch(24.1% 0.034 266.7), rgb(24, 31, 48).
Aa
White text reads best on this color (16.43:1).
About this color
#181F30 is a very dark, muted blue. In OKLCH its lightness is 24%, its chroma 0.034 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Dark (#1B2431), ΔE 0.019 away. White text reads best on it, at 16.43:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | muted (0.034) |
| Temperature | cool |
| Nearest name | Dark (#1B2431) |
| Black text | 1.27:1 |
| White text | 16.43:1 |
Values
| HEX | #181F30 |
| RGB | rgb(24, 31, 48) |
| HSL | hsl(223, 33%, 14%) |
| OKLCH | oklch(24.1% 0.034 266.7) |
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 #181F30 | 16.43:1 | AAA | Lc -105.8 | Preferred for body text |
| Black text on #181F30 | 1.27:1 | Fails | Lc 0.0 | Not readable |
| #181F30 text on white | 16.43:1 | AAA | Lc 103.4 | Preferred for body text |
| #181F30 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E6EAF2
oklch(93.6% 0.012 264.5)
-
Step 200
200
#D2D9E9
oklch(88.5% 0.023 266.9)
-
Step 300
300
#B5C1DC
oklch(81% 0.04 266.4)
-
Step 400
400
#8EA0CA
oklch(70.7% 0.065 266.7)
-
Step 500
500
#7288BC
oklch(63% 0.083 266.4)
-
Step 600
600
#5B71A9
oklch(55.5% 0.091 267.1)
-
Step 700
700
#4B5F91
oklch(49.2% 0.084 266.7)
-
Step 800
800
#3D4E75
oklch(42.7% 0.069 265.6)
-
Step 900
900
#34415F
oklch(37.8% 0.054 265.9)
-
Step 950
950 (this color)
#181F30
oklch(24.1% 0.034 266.7)
#181F30 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) | #192031 | 0.004 |
| Deuteranopia (no green cones) | #171E30 | 0.004 |
| Tritanopia (no blue cones) | #102325 | 0.032 |
| Achromatopsia (no color) | #1F1F1F | 0.034 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #181F30
#181F30
oklch(24.1% 0.034 266.7)
- #271E0B
#271E0B
oklch(24.1% 0.034 84.4)
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 #181F30, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark #1B2431 ΔE 0.019
- Rich Black #0D1B2A ΔE 0.025
- Oxford Blue #1B263B ΔE 0.029
- Jet #212529 ΔE 0.033
- Space Cadet #2B2D42 ΔE 0.064
- Gunmetal #293241 ΔE 0.075
- Navy Blue #001146 ΔE 0.075
- Rich Navy #001219 ΔE 0.076
Use #181F30 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.