#031F3F
Closest named color: Rich Black (#0D1B2A). oklch(24% 0.07 254), rgb(3, 31, 63).
Aa
White text reads best on this color (16.51:1).
About this color
#031F3F is a very dark, muted blue. In OKLCH its lightness is 24%, its chroma 0.070 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.041 away. White text reads best on it, at 16.51:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | muted (0.070) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.27:1 |
| White text | 16.51:1 |
Values
| HEX | #031F3F |
| RGB | rgb(3, 31, 63) |
| HSL | hsl(212, 91%, 13%) |
| OKLCH | oklch(24% 0.07 254) |
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 #031F3F | 16.51:1 | AAA | Lc -105.7 | Preferred for body text |
| Black text on #031F3F | 1.27:1 | Fails | Lc 0.0 | Not readable |
| #031F3F text on white | 16.51:1 | AAA | Lc 103.2 | Preferred for body text |
| #031F3F text on black | 1.27:1 | 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
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DFEBFA
oklch(93.6% 0.024 254)
-
Step 200
200
#C5DBF8
oklch(88.4% 0.047 255.4)
-
Step 300
300
#9CC4F6
oklch(80.9% 0.083 254.3)
-
Step 400
400
#63A3F1
oklch(70.6% 0.133 254.3)
-
Step 500
500
#328AEC
oklch(63.1% 0.169 254)
-
Step 600
600
#0072D7
oklch(55.6% 0.177 254)
-
Step 700
700
#005FB6
oklch(49% 0.157 254.2)
-
Step 800
800
#004E97
oklch(42.8% 0.136 254.1)
-
Step 900
900
#0B417A
oklch(37.6% 0.111 254.2)
-
Step 950
950 (this color)
#031F3F
oklch(24% 0.07 254)
#031F3F 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) | #0E2240 | 0.017 |
| Deuteranopia (no green cones) | #031C3E | 0.010 |
| Tritanopia (no blue cones) | #00272B | 0.054 |
| Achromatopsia (no color) | #1F1F1F | 0.070 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #031F3F
#031F3F
oklch(24% 0.07 254)
- #2D1B00
#2D1B00
oklch(24% 0.051 74.8)
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 #031F3F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.041
- Oxford Blue #1B263B ΔE 0.041
- Navy Blue #001146 ΔE 0.045
- Dark #1B2431 ΔE 0.046
- Jet #212529 ΔE 0.064
- Dark Indigo #1F0954 ΔE 0.073
- Night Blue #040348 ΔE 0.073
- Marine #042E60 ΔE 0.074
Use #031F3F 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.