#12183E
Closest named color: Navy Blue (#001146). oklch(22.9% 0.073 272.6), rgb(18, 24, 62).
Aa
White text reads best on this color (17.12:1).
About this color
#12183E is a very dark, moderately saturated blue. In OKLCH its lightness is 23%, its chroma 0.073 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Navy Blue (#001146), ΔE 0.038 away. White text reads best on it, at 17.12:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | moderately saturated (0.073) |
| Temperature | cool |
| Nearest name | Navy Blue (#001146) |
| Black text | 1.22:1 |
| White text | 17.12:1 |
Values
| HEX | #12183E |
| RGB | rgb(18, 24, 62) |
| HSL | hsl(232, 55%, 16%) |
| OKLCH | oklch(22.9% 0.073 272.6) |
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 #12183E | 17.12:1 | AAA | Lc -106.2 | Preferred for body text |
| Black text on #12183E | 1.22:1 | Fails | Lc 0.0 | Not readable |
| #12183E text on white | 17.12:1 | AAA | Lc 103.9 | Preferred for body text |
| #12183E text on black | 1.22:1 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E4E9FB
oklch(93.6% 0.025 273.5)
-
Step 200
200
#CED8FA
oklch(88.5% 0.048 272.4)
-
Step 300
300
#ADBEF9
oklch(81% 0.086 271.9)
-
Step 400
400
#8499F6
oklch(70.6% 0.138 272.8)
-
Step 500
500
#677DF2
oklch(63.1% 0.176 272.4)
-
Step 600
600
#5163E1
oklch(55.7% 0.191 272.5)
-
Step 700
700
#4251C3
oklch(49.1% 0.177 272.4)
-
Step 800
800
#36439E
oklch(42.7% 0.147 272.4)
-
Step 900
900
#2E3A7D
oklch(37.7% 0.114 272.2)
-
Step 950
950 (this color)
#12183E
oklch(22.9% 0.073 272.6)
#12183E 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) | #021E3F | 0.024 |
| Deuteranopia (no green cones) | #001A3D | 0.023 |
| Tritanopia (no blue cones) | #002128 | 0.062 |
| Achromatopsia (no color) | #1C1C1C | 0.073 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #12183E
#12183E
oklch(22.9% 0.073 272.6)
- #241C00
#241C00
oklch(22.9% 0.047 94)
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 #12183E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Navy Blue #001146 ΔE 0.038
- Rich Black #0D1B2A ΔE 0.043
- Oxford Blue #1B263B ΔE 0.051
- Dark #1B2431 ΔE 0.055
- Dark Indigo #1F0954 ΔE 0.055
- Night Blue #040348 ΔE 0.061
- Midnight Purple #280137 ΔE 0.070
- Jet #212529 ΔE 0.072
Use #12183E 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.