#12182C
Closest named color: Rich Black (#0D1B2A). oklch(21.4% 0.041 270.1), rgb(18, 24, 44).
Aa
White text reads best on this color (17.60:1).
About this color
#12182C is a very dark, muted blue. In OKLCH its lightness is 21%, its chroma 0.041 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.014 away. White text reads best on it, at 17.60:1.
| Hue family | Blues |
| Lightness | very dark (21%) |
| Chroma | muted (0.041) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.19:1 |
| White text | 17.60:1 |
Values
| HEX | #12182C |
| RGB | rgb(18, 24, 44) |
| HSL | hsl(226, 42%, 12%) |
| OKLCH | oklch(21.4% 0.041 270.1) |
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 #12182C | 17.60:1 | AAA | Lc -106.6 | Preferred for body text |
| Black text on #12182C | 1.19:1 | Fails | Lc 0.0 | Not readable |
| #12182C text on white | 17.60:1 | AAA | Lc 104.4 | Preferred for body text |
| #12182C text on black | 1.19:1 | 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
#E6EAF3
oklch(93.7% 0.013 266.7)
-
Step 200
200
#D2D9EB
oklch(88.5% 0.026 268.8)
-
Step 300
300
#B4C0E1
oklch(80.9% 0.049 269.5)
-
Step 400
400
#8E9FD1
oklch(70.8% 0.076 269.9)
-
Step 500
500
#7286C5
oklch(63% 0.098 270)
-
Step 600
600
#5B6FB2
oklch(55.6% 0.107 270.1)
-
Step 700
700
#4B5D99
oklch(49.2% 0.099 269.9)
-
Step 800
800
#3E4C7C
oklch(42.8% 0.082 270.3)
-
Step 900
900
#344064
oklch(37.8% 0.064 269.2)
-
Step 950
950 (this color)
#12182C
oklch(21.4% 0.041 270.1)
#12182C 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) | #101A2D | 0.007 |
| Deuteranopia (no green cones) | #0E182C | 0.006 |
| Tritanopia (no blue cones) | #081C1F | 0.037 |
| Achromatopsia (no color) | #191919 | 0.041 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #12182C
#12182C
oklch(21.4% 0.041 270.1)
- #211802
#211802
oklch(21.5% 0.04 88.1)
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 #12182C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.014
- Dark #1B2431 ΔE 0.046
- Rich Navy #001219 ΔE 0.054
- Oxford Blue #1B263B ΔE 0.055
- Jet #212529 ΔE 0.057
- Navy Blue #001146 ΔE 0.062
- Almost Black #070D0D ΔE 0.073
- Midnight Purple #280137 ΔE 0.077
Use #12182C 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.