#09182B
Closest named color: Rich Black (#0D1B2A). oklch(20.7% 0.043 255.2), rgb(9, 24, 43).
Aa
White text reads best on this color (17.83:1).
About this color
#09182B is a very dark, muted blue. In OKLCH its lightness is 21%, its chroma 0.043 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.013 away. White text reads best on it, at 17.83:1.
| Hue family | Blues |
| Lightness | very dark (21%) |
| Chroma | muted (0.043) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.17:1 |
| White text | 17.83:1 |
Values
| HEX | #09182B |
| RGB | rgb(9, 24, 43) |
| HSL | hsl(214, 65%, 10%) |
| OKLCH | oklch(20.7% 0.043 255.2) |
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 #09182B | 17.83:1 | AAA | Lc -106.7 | Preferred for body text |
| Black text on #09182B | 1.17:1 | Fails | Lc 0.0 | Not readable |
| #09182B text on white | 17.83:1 | AAA | Lc 104.5 | Preferred for body text |
| #09182B text on black | 1.17:1 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E3EBF4
oklch(93.7% 0.015 251.2)
-
Step 200
200
#CDDAEC
oklch(88.4% 0.029 256.5)
-
Step 300
300
#ABC3E2
oklch(80.9% 0.051 254.9)
-
Step 400
400
#7EA3D3
oklch(70.6% 0.082 255.2)
-
Step 500
500
#5D8CC8
oklch(63.2% 0.105 255.1)
-
Step 600
600
#4275B5
oklch(55.7% 0.114 255)
-
Step 700
700
#34629B
oklch(49.1% 0.105 254.9)
-
Step 800
800
#2C507E
oklch(42.7% 0.087 255.4)
-
Step 900
900
#284365
oklch(37.8% 0.067 254.9)
-
Step 950
950 (this color)
#09182B
oklch(20.7% 0.043 255.2)
#09182B 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) | #10192C | 0.011 |
| Deuteranopia (no green cones) | #0B162B | 0.007 |
| Tritanopia (no blue cones) | #001C1F | 0.034 |
| Achromatopsia (no color) | #181818 | 0.043 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #09182B
#09182B
oklch(20.7% 0.043 255.2)
- #231400
#231400
oklch(20.7% 0.044 74.7)
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 #09182B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.013
- Rich Navy #001219 ΔE 0.045
- Dark #1B2431 ΔE 0.053
- Navy Blue #001146 ΔE 0.060
- Oxford Blue #1B263B ΔE 0.062
- Jet #212529 ΔE 0.065
- Almost Black #070D0D ΔE 0.067
- Dark Navy #000435 ΔE 0.071
Use #09182B 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.