#12173C
Closest named color: Navy Blue (#001146). oklch(22.5% 0.071 273.5), rgb(18, 23, 60).
Aa
White text reads best on this color (17.30:1).
About this color
#12173C is a very dark, moderately saturated blue. In OKLCH its lightness is 22%, its chroma 0.071 and its hue 274°. 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 17.30:1.
| Hue family | Blues |
| Lightness | very dark (22%) |
| Chroma | moderately saturated (0.071) |
| Temperature | cool |
| Nearest name | Navy Blue (#001146) |
| Black text | 1.21:1 |
| White text | 17.30:1 |
Values
| HEX | #12173C |
| RGB | rgb(18, 23, 60) |
| HSL | hsl(233, 54%, 15%) |
| OKLCH | oklch(22.5% 0.071 273.5) |
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 #12173C | 17.30:1 | AAA | Lc -106.3 | Preferred for body text |
| Black text on #12173C | 1.21:1 | Fails | Lc 0.0 | Not readable |
| #12173C text on white | 17.30:1 | AAA | Lc 104.0 | Preferred for body text |
| #12173C text on black | 1.21:1 | 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
#CFD8F9
oklch(88.6% 0.047 273.4)
-
Step 300
300
#AFBDF7
oklch(80.8% 0.084 273.9)
-
Step 400
400
#8699F4
oklch(70.7% 0.135 273.5)
-
Step 500
500
#6A7DEF
oklch(63.1% 0.171 273.4)
-
Step 600
600
#5463DE
oklch(55.6% 0.186 273.5)
-
Step 700
700
#4551C1
oklch(49.1% 0.174 273.5)
-
Step 800
800
#38439C
oklch(42.7% 0.144 273.3)
-
Step 900
900
#303A7C
oklch(37.8% 0.112 273.4)
-
Step 950
950 (this color)
#12173C
oklch(22.5% 0.071 273.5)
#12173C 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) | #021C3D | 0.023 |
| Deuteranopia (no green cones) | #00193B | 0.023 |
| Tritanopia (no blue cones) | #002026 | 0.062 |
| Achromatopsia (no color) | #1B1B1B | 0.071 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #12173C
#12173C
oklch(22.5% 0.071 273.5)
- #231B00
#231B00
oklch(22.5% 0.046 93.6)
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 #12173C, 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 0.041
- Oxford Blue #1B263B ΔE 0.054
- Dark #1B2431 ΔE 0.056
- Dark Indigo #1F0954 ΔE 0.057
- Night Blue #040348 ΔE 0.060
- Midnight Purple #280137 ΔE 0.068
- Dark Navy #000435 ΔE 0.071
Use #12173C 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.