#031B30
Closest named color: Rich Black (#0D1B2A). oklch(21.6% 0.051 247.6), rgb(3, 27, 48).
Aa
White text reads best on this color (17.45:1).
About this color
#031B30 is a very dark, muted blue. In OKLCH its lightness is 22%, its chroma 0.051 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.016 away. White text reads best on it, at 17.45:1.
| Hue family | Blues |
| Lightness | very dark (22%) |
| Chroma | muted (0.051) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.20:1 |
| White text | 17.45:1 |
Values
| HEX | #031B30 |
| RGB | rgb(3, 27, 48) |
| HSL | hsl(208, 88%, 10%) |
| OKLCH | oklch(21.6% 0.051 247.6) |
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 #031B30 | 17.45:1 | AAA | Lc -106.4 | Preferred for body text |
| Black text on #031B30 | 1.20:1 | Fails | Lc 0.0 | Not readable |
| #031B30 text on white | 17.45:1 | AAA | Lc 104.1 | Preferred for body text |
| #031B30 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
#E1EBF5
oklch(93.5% 0.017 248)
-
Step 200
200
#C8DCEF
oklch(88.5% 0.034 246.8)
-
Step 300
300
#A2C5E7
oklch(80.9% 0.061 247.8)
-
Step 400
400
#6EA6DA
oklch(70.7% 0.097 247.6)
-
Step 500
500
#438FD1
oklch(63.2% 0.125 247.5)
-
Step 600
600
#1D78BE
oklch(55.7% 0.135 247.5)
-
Step 700
700
#0C64A4
oklch(49.1% 0.127 247.9)
-
Step 800
800
#115285
oklch(42.7% 0.105 247.9)
-
Step 900
900
#17446A
oklch(37.6% 0.081 247.7)
-
Step 950
950 (this color)
#031B30
oklch(21.6% 0.051 247.6)
#031B30 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) | #111C31 | 0.019 |
| Deuteranopia (no green cones) | #0A1830 | 0.012 |
| Tritanopia (no blue cones) | #002023 | 0.036 |
| Achromatopsia (no color) | #1A1A1A | 0.051 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #031B30
#031B30
oklch(21.6% 0.051 247.6)
- #281500
#281500
oklch(21.7% 0.048 68.3)
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 #031B30, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.016
- Dark #1B2431 ΔE 0.048
- Rich Navy #001219 ΔE 0.054
- Navy Blue #001146 ΔE 0.054
- Oxford Blue #1B263B ΔE 0.055
- Jet #212529 ΔE 0.062
- Dark Navy #000435 ΔE 0.074
- Night Blue #040348 ΔE 0.078
Use #031B30 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.