#031739
Closest named color: Navy Blue (#001146). oklch(21.3% 0.072 259.2), rgb(3, 23, 57).
Aa
White text reads best on this color (17.71:1).
About this color
#031739 is a very dark, moderately saturated blue. In OKLCH its lightness is 21%, its chroma 0.072 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Navy Blue (#001146), ΔE 0.031 away. White text reads best on it, at 17.71:1.
| Hue family | Blues |
| Lightness | very dark (21%) |
| Chroma | moderately saturated (0.072) |
| Temperature | cool |
| Nearest name | Navy Blue (#001146) |
| Black text | 1.18:1 |
| White text | 17.71:1 |
Values
| HEX | #031739 |
| RGB | rgb(3, 23, 57) |
| HSL | hsl(218, 90%, 12%) |
| OKLCH | oklch(21.3% 0.072 259.2) |
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 #031739 | 17.71:1 | AAA | Lc -106.5 | Preferred for body text |
| Black text on #031739 | 1.18:1 | Fails | Lc 0.0 | Not readable |
| #031739 text on white | 17.71:1 | AAA | Lc 104.3 | Preferred for body text |
| #031739 text on black | 1.18:1 | 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
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C7DAF9
oklch(88.4% 0.048 260.2)
-
Step 300
300
#A0C2F8
oklch(80.9% 0.085 259.5)
-
Step 400
400
#6CA1F4
oklch(70.8% 0.135 259.1)
-
Step 500
500
#4386F0
oklch(63% 0.173 259.3)
-
Step 600
600
#226DDF
oklch(55.6% 0.189 259.3)
-
Step 700
700
#145AC2
oklch(49.1% 0.176 259.3)
-
Step 800
800
#144A9D
oklch(42.6% 0.146 259.4)
-
Step 900
900
#183F7C
oklch(37.6% 0.113 259.2)
-
Step 950
950 (this color)
#031739
oklch(21.3% 0.072 259.2)
#031739 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) | #031B3A | 0.013 |
| Deuteranopia (no green cones) | #001638 | 0.006 |
| Tritanopia (no blue cones) | #001F25 | 0.054 |
| Achromatopsia (no color) | #181818 | 0.072 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #031739
#031739
oklch(21.3% 0.072 259.2)
- #241600
#241600
oklch(21.3% 0.044 78.3)
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 #031739, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Navy Blue #001146 ΔE 0.031
- Rich Black #0D1B2A ΔE 0.037
- Night Blue #040348 ΔE 0.055
- Dark Navy #000435 ΔE 0.058
- Dark #1B2431 ΔE 0.063
- Oxford Blue #1B263B ΔE 0.064
- Rich Navy #001219 ΔE 0.066
- Very Dark Blue #000133 ΔE 0.070
Use #031739 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.