#0C1731
Closest named color: Rich Black (#0D1B2A). oklch(21.1% 0.054 264.9), rgb(12, 23, 49).
Aa
White text reads best on this color (17.75:1).
About this color
#0C1731 is a very dark, muted blue. In OKLCH its lightness is 21%, its chroma 0.054 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.022 away. White text reads best on it, at 17.75:1.
| Hue family | Blues |
| Lightness | very dark (21%) |
| Chroma | muted (0.054) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.18:1 |
| White text | 17.75:1 |
Values
| HEX | #0C1731 |
| RGB | rgb(12, 23, 49) |
| HSL | hsl(222, 61%, 12%) |
| OKLCH | oklch(21.1% 0.054 264.9) |
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 #0C1731 | 17.75:1 | AAA | Lc -106.7 | Preferred for body text |
| Black text on #0C1731 | 1.18:1 | Fails | Lc 0.0 | Not readable |
| #0C1731 text on white | 17.75:1 | AAA | Lc 104.4 | Preferred for body text |
| #0C1731 text on black | 1.18:1 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E4EAF7
oklch(93.6% 0.019 266)
-
Step 200
200
#CED9F1
oklch(88.4% 0.035 266)
-
Step 300
300
#ADC1EB
oklch(81% 0.064 265)
-
Step 400
400
#819FE1
oklch(70.6% 0.103 265.1)
-
Step 500
500
#6286D8
oklch(63% 0.131 265)
-
Step 600
600
#4A6EC6
oklch(55.6% 0.143 265.3)
-
Step 700
700
#3B5CAB
oklch(49.2% 0.132 264.9)
-
Step 800
800
#314B8A
oklch(42.6% 0.109 265.2)
-
Step 900
900
#2B3F6F
oklch(37.6% 0.086 265.4)
-
Step 950
950 (this color)
#0C1731
oklch(21.1% 0.054 264.9)
#0C1731 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) | #0B1A32 | 0.010 |
| Deuteranopia (no green cones) | #061630 | 0.010 |
| Tritanopia (no blue cones) | #001D21 | 0.046 |
| Achromatopsia (no color) | #181818 | 0.054 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0C1731
#0C1731
oklch(21.1% 0.054 264.9)
- #221700
#221700
oklch(21.3% 0.044 85.3)
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 #0C1731, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.022
- Navy Blue #001146 ΔE 0.048
- Dark #1B2431 ΔE 0.054
- Rich Navy #001219 ΔE 0.056
- Oxford Blue #1B263B ΔE 0.059
- Dark Navy #000435 ΔE 0.066
- Jet #212529 ΔE 0.068
- Night Blue #040348 ΔE 0.069
Use #0C1731 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.