#031B2C
Closest named color: Rich Black (#0D1B2A). oklch(21.3% 0.045 242.3), rgb(3, 27, 44).
Aa
White text reads best on this color (17.54:1).
About this color
#031B2C is a very dark, muted blue. In OKLCH its lightness is 21%, its chroma 0.045 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.012 away. White text reads best on it, at 17.54:1.
| Hue family | Blues |
| Lightness | very dark (21%) |
| Chroma | muted (0.045) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.19:1 |
| White text | 17.54:1 |
Values
| HEX | #031B2C |
| RGB | rgb(3, 27, 44) |
| HSL | hsl(205, 87%, 9%) |
| OKLCH | oklch(21.3% 0.045 242.3) |
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 #031B2C | 17.54:1 | AAA | Lc -106.5 | Preferred for body text |
| Black text on #031B2C | 1.19:1 | Fails | Lc 0.0 | Not readable |
| #031B2C text on white | 17.54:1 | AAA | Lc 104.2 | Preferred for body text |
| #031B2C 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1EBF4
oklch(93.5% 0.016 245.1)
-
Step 200
200
#C9DCEC
oklch(88.5% 0.03 243.4)
-
Step 300
300
#A3C6E1
oklch(81% 0.054 241.5)
-
Step 400
400
#6FA7D2
oklch(70.6% 0.086 242.5)
-
Step 500
500
#4691C6
oklch(63.2% 0.109 242.1)
-
Step 600
600
#217AB3
oklch(55.6% 0.119 242.4)
-
Step 700
700
#10669A
oklch(49% 0.112 242.7)
-
Step 800
800
#13547D
oklch(42.8% 0.092 242.2)
-
Step 900
900
#194564
oklch(37.6% 0.072 242.8)
-
Step 950
950 (this color)
#031B2C
oklch(21.3% 0.045 242.3)
#031B2C 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) | #131B2D | 0.021 |
| Deuteranopia (no green cones) | #0D172C | 0.018 |
| Tritanopia (no blue cones) | #001F21 | 0.031 |
| Achromatopsia (no color) | #191919 | 0.045 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #031B2C
#031B2C
oklch(21.3% 0.045 242.3)
- #271402
#271402
oklch(21.4% 0.044 63.8)
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 #031B2C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.012
- Rich Navy #001219 ΔE 0.048
- Dark #1B2431 ΔE 0.049
- Oxford Blue #1B263B ΔE 0.058
- Jet #212529 ΔE 0.061
- Navy Blue #001146 ΔE 0.062
- Almost Black #070D0D ΔE 0.072
- Dark Navy #000435 ΔE 0.077
Use #031B2C 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.