#031B33
Closest named color: Rich Black (#0D1B2A). oklch(21.8% 0.056 250.6), rgb(3, 27, 51).
Aa
White text reads best on this color (17.37:1).
About this color
#031B33 is a very dark, muted blue. In OKLCH its lightness is 22%, its chroma 0.056 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.021 away. White text reads best on it, at 17.37:1.
| Hue family | Blues |
| Lightness | very dark (22%) |
| Chroma | muted (0.056) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.20:1 |
| White text | 17.37:1 |
Values
| HEX | #031B33 |
| RGB | rgb(3, 27, 51) |
| HSL | hsl(210, 89%, 11%) |
| OKLCH | oklch(21.8% 0.056 250.6) |
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 #031B33 | 17.37:1 | AAA | Lc -106.4 | Preferred for body text |
| Black text on #031B33 | 1.20:1 | Fails | Lc 0.0 | Not readable |
| #031B33 text on white | 17.37:1 | AAA | Lc 104.0 | Preferred for body text |
| #031B33 text on black | 1.20:1 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF7
oklch(93.6% 0.019 252.9)
-
Step 200
200
#C8DCF1
oklch(88.6% 0.036 249.5)
-
Step 300
300
#A1C4EB
oklch(80.8% 0.067 251.4)
-
Step 400
400
#6CA5E1
oklch(70.7% 0.107 250.7)
-
Step 500
500
#418DD8
oklch(63% 0.136 250.6)
-
Step 600
600
#1B76C6
oklch(55.7% 0.148 250.6)
-
Step 700
700
#0962AB
oklch(49% 0.138 250.9)
-
Step 800
800
#0F518A
oklch(42.8% 0.113 250.3)
-
Step 900
900
#16436F
oklch(37.6% 0.09 251.1)
-
Step 950
950 (this color)
#031B33
oklch(21.8% 0.056 250.6)
#031B33 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) | #0F1D34 | 0.017 |
| Deuteranopia (no green cones) | #071833 | 0.011 |
| Tritanopia (no blue cones) | #002124 | 0.042 |
| Achromatopsia (no color) | #1A1A1A | 0.056 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #031B33
#031B33
oklch(21.8% 0.056 250.6)
- #281600
#281600
oklch(22% 0.047 70.9)
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 #031B33, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.021
- Dark #1B2431 ΔE 0.049
- Navy Blue #001146 ΔE 0.049
- Oxford Blue #1B263B ΔE 0.054
- Rich Navy #001219 ΔE 0.059
- Jet #212529 ΔE 0.064
- Dark Navy #000435 ΔE 0.073
- Night Blue #040348 ΔE 0.074
Use #031B33 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.