#031E37
Closest named color: Rich Black (#0D1B2A). oklch(23% 0.059 249.5), rgb(3, 30, 55).
Aa
White text reads best on this color (16.87:1).
About this color
#031E37 is a very dark, muted blue. In OKLCH its lightness is 23%, its chroma 0.059 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.026 away. White text reads best on it, at 16.87:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | muted (0.059) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.24:1 |
| White text | 16.87:1 |
Values
| HEX | #031E37 |
| RGB | rgb(3, 30, 55) |
| HSL | hsl(209, 90%, 11%) |
| OKLCH | oklch(23% 0.059 249.5) |
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 #031E37 | 16.87:1 | AAA | Lc -106.0 | Preferred for body text |
| Black text on #031E37 | 1.24:1 | Fails | Lc 0.0 | Not readable |
| #031E37 text on white | 16.87:1 | AAA | Lc 103.6 | Preferred for body text |
| #031E37 text on black | 1.24:1 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF7
oklch(93.5% 0.02 250.4)
-
Step 200
200
#C6DCF2
oklch(88.5% 0.038 248.3)
-
Step 300
300
#9FC5EC
oklch(80.9% 0.069 249.4)
-
Step 400
400
#68A6E3
oklch(70.8% 0.111 249.3)
-
Step 500
500
#398EDB
oklch(63.2% 0.142 249.3)
-
Step 600
600
#0476C9
oklch(55.6% 0.155 249.7)
-
Step 700
700
#0063AA
oklch(49.1% 0.137 249.4)
-
Step 800
800
#01518C
oklch(42.7% 0.118 249.3)
-
Step 900
900
#114470
oklch(37.8% 0.092 249.2)
-
Step 950
950 (this color)
#031E37
oklch(23% 0.059 249.5)
#031E37 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) | #122038 | 0.020 |
| Deuteranopia (no green cones) | #091B37 | 0.011 |
| Tritanopia (no blue cones) | #002427 | 0.043 |
| Achromatopsia (no color) | #1D1D1D | 0.059 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #031E37
#031E37
oklch(23% 0.059 249.5)
- #2C1800
#2C1800
oklch(23.1% 0.05 69.3)
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 #031E37, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.026
- Dark #1B2431 ΔE 0.042
- Oxford Blue #1B263B ΔE 0.044
- Navy Blue #001146 ΔE 0.051
- Jet #212529 ΔE 0.058
- Rich Navy #001219 ΔE 0.070
- Night Blue #040348 ΔE 0.078
- Space Cadet #2B2D42 ΔE 0.081
Use #031E37 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.