#0C172A
Closest named color: Rich Black (#0D1B2A). oklch(20.5% 0.041 260.7), rgb(12, 23, 42).
Aa
White text reads best on this color (17.92:1).
About this color
#0C172A is a very dark, muted blue. In OKLCH its lightness is 21%, its chroma 0.041 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.015 away. White text reads best on it, at 17.92:1.
| Hue family | Blues |
| Lightness | very dark (21%) |
| Chroma | muted (0.041) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.17:1 |
| White text | 17.92:1 |
Values
| HEX | #0C172A |
| RGB | rgb(12, 23, 42) |
| HSL | hsl(218, 56%, 11%) |
| OKLCH | oklch(20.5% 0.041 260.7) |
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 #0C172A | 17.92:1 | AAA | Lc -106.8 | Preferred for body text |
| Black text on #0C172A | 1.17:1 | Fails | Lc 0.0 | Not readable |
| #0C172A text on white | 17.92:1 | AAA | Lc 104.6 | Preferred for body text |
| #0C172A 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E5EAF4
oklch(93.6% 0.015 264.5)
-
Step 200
200
#CFDAEC
oklch(88.5% 0.028 260.3)
-
Step 300
300
#AFC2E1
oklch(81% 0.049 260.2)
-
Step 400
400
#85A1D2
oklch(70.6% 0.079 261.4)
-
Step 500
500
#668AC6
oklch(63.2% 0.1 260.3)
-
Step 600
600
#4D73B3
oklch(55.7% 0.109 260.3)
-
Step 700
700
#3E609A
oklch(49.1% 0.102 260.5)
-
Step 800
800
#344E7D
oklch(42.6% 0.085 261.5)
-
Step 900
900
#2D4164
oklch(37.6% 0.066 261.1)
-
Step 950
950 (this color)
#0C172A
oklch(20.5% 0.041 260.7)
#0C172A 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) | #0F192B | 0.009 |
| Deuteranopia (no green cones) | #0B162A | 0.004 |
| Tritanopia (no blue cones) | #001B1E | 0.036 |
| Achromatopsia (no color) | #171717 | 0.041 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0C172A
#0C172A
oklch(20.5% 0.041 260.7)
- #211501
#211501
oklch(20.6% 0.041 80.2)
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 #0C172A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.015
- Rich Navy #001219 ΔE 0.044
- Dark #1B2431 ΔE 0.054
- Navy Blue #001146 ΔE 0.061
- Oxford Blue #1B263B ΔE 0.064
- Jet #212529 ΔE 0.065
- Almost Black #070D0D ΔE 0.065
- Dark Navy #000435 ΔE 0.071
Use #0C172A 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.