#031B2A
Closest named color: Rich Black (#0D1B2A). oklch(21.2% 0.043 239), rgb(3, 27, 42).
Aa
White text reads best on this color (17.58:1).
About this color
#031B2A is a very dark, muted blue. In OKLCH its lightness is 21%, its chroma 0.043 and its hue 239°. 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 17.58:1.
| Hue family | Blues |
| Lightness | very dark (21%) |
| Chroma | muted (0.043) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.19:1 |
| White text | 17.58:1 |
Values
| HEX | #031B2A |
| RGB | rgb(3, 27, 42) |
| HSL | hsl(203, 87%, 9%) |
| OKLCH | oklch(21.2% 0.043 239) |
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 #031B2A | 17.58:1 | AAA | Lc -106.5 | Preferred for body text |
| Black text on #031B2A | 1.19:1 | Fails | Lc 0.0 | Not readable |
| #031B2A text on white | 17.58:1 | AAA | Lc 104.3 | Preferred for body text |
| #031B2A 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
#E1EBF3
oklch(93.5% 0.015 241.8)
-
Step 200
200
#C9DCEA
oklch(88.5% 0.028 239.7)
-
Step 300
300
#A4C6DE
oklch(81% 0.05 239)
-
Step 400
400
#70A8CE
oklch(70.7% 0.081 239.1)
-
Step 500
500
#4792C1
oklch(63.2% 0.103 238.8)
-
Step 600
600
#227BAD
oklch(55.6% 0.112 238.9)
-
Step 700
700
#126795
oklch(49% 0.105 239.5)
-
Step 800
800
#145579
oklch(42.8% 0.086 238.7)
-
Step 900
900
#194661
oklch(37.7% 0.067 238.6)
-
Step 950
950 (this color)
#031B2A
oklch(21.2% 0.043 239)
#031B2A 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) | #141B2B | 0.023 |
| Deuteranopia (no green cones) | #0E172A | 0.019 |
| Tritanopia (no blue cones) | #001F20 | 0.029 |
| Achromatopsia (no color) | #191919 | 0.043 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #031B2A
#031B2A
oklch(21.2% 0.043 239)
- #271303
#271303
oklch(21.1% 0.043 59)
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 #031B2A, 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 0.045
- Dark #1B2431 ΔE 0.050
- Oxford Blue #1B263B ΔE 0.060
- Jet #212529 ΔE 0.060
- Navy Blue #001146 ΔE 0.065
- Almost Black #070D0D ΔE 0.069
- Dark Navy #000435 ΔE 0.079
Use #031B2A 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.