#031B39
Closest named color: Rich Black (#0D1B2A). oklch(22.3% 0.066 255.1), rgb(3, 27, 57).
Aa
White text reads best on this color (17.21:1).
About this color
#031B39 is a very dark, muted blue. In OKLCH its lightness is 22%, its chroma 0.066 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.031 away. White text reads best on it, at 17.21:1.
| Hue family | Blues |
| Lightness | very dark (22%) |
| Chroma | muted (0.066) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.21:1 |
| White text | 17.21:1 |
Values
| HEX | #031B39 |
| RGB | rgb(3, 27, 57) |
| HSL | hsl(213, 90%, 12%) |
| OKLCH | oklch(22.3% 0.066 255.1) |
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 #031B39 | 17.21:1 | AAA | Lc -106.2 | Preferred for body text |
| Black text on #031B39 | 1.21:1 | Fails | Lc 0.0 | Not readable |
| #031B39 text on white | 17.21:1 | AAA | Lc 103.9 | Preferred for body text |
| #031B39 text on black | 1.21:1 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBF9
oklch(93.6% 0.022 254.4)
-
Step 200
200
#C7DBF6
oklch(88.5% 0.043 255.9)
-
Step 300
300
#9FC4F3
oklch(81% 0.078 254.6)
-
Step 400
400
#69A3ED
oklch(70.7% 0.125 255.1)
-
Step 500
500
#3D8AE7
oklch(63.1% 0.159 255)
-
Step 600
600
#1471D5
oklch(55.5% 0.174 255.2)
-
Step 700
700
#025EB9
oklch(49% 0.162 255.3)
-
Step 800
800
#0A4E95
oklch(42.7% 0.132 254.7)
-
Step 900
900
#144177
oklch(37.6% 0.104 255.3)
-
Step 950
950 (this color)
#031B39
oklch(22.3% 0.066 255.1)
#031B39 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) | #0B1E3A | 0.015 |
| Deuteranopia (no green cones) | #011938 | 0.008 |
| Tritanopia (no blue cones) | #002227 | 0.048 |
| Achromatopsia (no color) | #1B1B1B | 0.066 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #031B39
#031B39
oklch(22.3% 0.066 255.1)
- #281800
#281800
oklch(22.5% 0.047 76)
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 #031B39, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.031
- Navy Blue #001146 ΔE 0.040
- Dark #1B2431 ΔE 0.051
- Oxford Blue #1B263B ΔE 0.052
- Night Blue #040348 ΔE 0.066
- Jet #212529 ΔE 0.068
- Rich Navy #001219 ΔE 0.069
- Dark Navy #000435 ΔE 0.071
Use #031B39 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.