#31538B
Closest named color: Dusk Blue (#26538D). oklch(44.5% 0.101 259.9), rgb(49, 83, 139).
Aa
White text reads best on this color (7.66:1).
About this color
#31538B is a dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.101 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.011 away. White text reads best on it, at 7.66:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | moderately saturated (0.101) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.74:1 |
| White text | 7.66:1 |
Values
| HEX | #31538B |
| RGB | rgb(49, 83, 139) |
| HSL | hsl(217, 48%, 37%) |
| OKLCH | oklch(44.5% 0.101 259.9) |
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 #31538B | 7.66:1 | AAA | Lc -91.2 | Preferred for body text |
| Black text on #31538B | 2.74:1 | Fails | Lc 17.6 | Dividers and decoration only |
| #31538B text on white | 7.66:1 | AAA | Lc 86.4 | Fine for body text |
| #31538B text on black | 2.74:1 | Fails | Lc -15.7 | 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
#E3EAF6
oklch(93.5% 0.018 261.3)
-
Step 200
200
#CDDAEF
oklch(88.5% 0.032 260)
-
Step 300
300
#ABC2E7
oklch(80.9% 0.058 259.9)
-
Step 400
400
#7EA2DB
oklch(70.8% 0.093 259.4)
-
Step 500
500
#5D89D2
oklch(63.1% 0.121 260.1)
-
Step 600
600
#4372BF
oklch(55.6% 0.131 259.8)
-
Step 700
700
#355FA5
oklch(49.1% 0.122 260)
-
Step 800
800 (this color)
#31538B
oklch(44.5% 0.101 259.9)
-
Step 900
900
#28416B
oklch(37.7% 0.079 260.2)
-
Step 950
950
#18263F
oklch(27% 0.051 261.4)
#31538B 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) | #3A588D | 0.019 |
| Deuteranopia (no green cones) | #2E4F8A | 0.013 |
| Tritanopia (no blue cones) | #006068 | 0.085 |
| Achromatopsia (no color) | #535353 | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31538B
#31538B
oklch(44.5% 0.101 259.9)
- #6E4D00
#6E4D00
oklch(44.5% 0.092 80.2)
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 #31538B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.011
- Light Navy Blue #2E5A88 ΔE 0.022
- Denim Blue #3B5B92 ΔE 0.028
- Light Navy #155084 ΔE 0.029
- Deep Sea Blue #015482 ΔE 0.035
- Twilight #4E518B ΔE 0.037
- Cobalt #1E488F ΔE 0.041
- Dusk #4E5481 ΔE 0.041
Use #31538B 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.