#31578E
Closest named color: Light Navy Blue (#2E5A88). oklch(45.6% 0.1 257.7), rgb(49, 87, 142).
Aa
White text reads best on this color (7.28:1).
About this color
#31578E is a medium-dark, moderately saturated blue. In OKLCH its lightness is 46%, its chroma 0.100 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Light Navy Blue (#2E5A88), ΔE 0.015 away. White text reads best on it, at 7.28:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Light Navy Blue (#2E5A88) |
| Black text | 2.88:1 |
| White text | 7.28:1 |
Values
| HEX | #31578E |
| RGB | rgb(49, 87, 142) |
| HSL | hsl(215, 49%, 37%) |
| OKLCH | oklch(45.6% 0.1 257.7) |
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 #31578E | 7.28:1 | AAA | Lc -90.0 | Fine for body text |
| Black text on #31578E | 2.88:1 | Fails | Lc 18.9 | Dividers and decoration only |
| #31578E text on white | 7.28:1 | AAA | Lc 85.1 | Fine for body text |
| #31578E text on black | 2.88:1 | Fails | Lc -16.9 | Dividers and decoration only |
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 800.
-
Step 50
50
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EAF5
oklch(93.5% 0.017 259.4)
-
Step 200
200
#CCDAEF
oklch(88.4% 0.033 258.4)
-
Step 300
300
#A9C2E7
oklch(80.8% 0.059 258.1)
-
Step 400
400
#7BA2DB
oklch(70.6% 0.094 257.8)
-
Step 500
500
#5A8AD1
oklch(63.1% 0.12 258)
-
Step 600
600
#3F73BE
oklch(55.6% 0.13 257.7)
-
Step 700
700
#3160A4
oklch(49.1% 0.121 257.8)
-
Step 800
800 (this color)
#31578E
oklch(45.6% 0.1 257.7)
-
Step 900
900
#26426A
oklch(37.8% 0.077 257.4)
-
Step 950
950
#16273E
oklch(27% 0.049 256.3)
#31578E 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) | #3F5B90 | 0.021 |
| Deuteranopia (no green cones) | #32538D | 0.011 |
| Tritanopia (no blue cones) | #00646B | 0.084 |
| Achromatopsia (no color) | #575757 | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31578E
#31578E
oklch(45.6% 0.1 257.7)
- #744F00
#744F00
oklch(45.7% 0.095 77.7)
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 #31578E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Light Navy Blue #2E5A88 ΔE 0.015
- Dusk Blue #26538D ΔE 0.017
- Denim Blue #3B5B92 ΔE 0.018
- Light Navy #155084 ΔE 0.037
- Dusky Blue #475F94 ΔE 0.038
- Twilight #4E518B ΔE 0.038
- Deep Sea Blue #015482 ΔE 0.039
- Denim #3B638C ΔE 0.040
Use #31578E 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.