#31549B
Closest named color: Dusk Blue (#26538D). oklch(45.8% 0.123 262.8), rgb(49, 84, 155).
Aa
White text reads best on this color (7.31:1).
About this color
#31549B is a medium-dark, moderately saturated blue. In OKLCH its lightness is 46%, its chroma 0.123 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.026 away. White text reads best on it, at 7.31:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.123) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.87:1 |
| White text | 7.31:1 |
Values
| HEX | #31549B |
| RGB | rgb(49, 84, 155) |
| HSL | hsl(220, 52%, 40%) |
| OKLCH | oklch(45.8% 0.123 262.8) |
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 #31549B | 7.31:1 | AAA | Lc -90.0 | Preferred for body text |
| Black text on #31549B | 2.87:1 | Fails | Lc 18.9 | Dividers and decoration only |
| #31549B text on white | 7.31:1 | AAA | Lc 85.1 | Fine for body text |
| #31549B text on black | 2.87:1 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E3EAF8
oklch(93.6% 0.02 264.5)
-
Step 200
200
#CBDAF4
oklch(88.5% 0.039 261.5)
-
Step 300
300
#A8C1F0
oklch(80.9% 0.072 262.9)
-
Step 400
400
#7AA0E8
oklch(70.7% 0.114 262.5)
-
Step 500
500
#5886E1
oklch(63% 0.146 262.7)
-
Step 600
600
#3E6ECF
oklch(55.6% 0.159 262.6)
-
Step 700
700
#315BB3
oklch(49% 0.148 262.9)
-
Step 800
800 (this color)
#31549B
oklch(45.8% 0.123 262.8)
-
Step 900
900
#253F74
oklch(37.6% 0.096 262.9)
-
Step 950
950
#162544
oklch(26.9% 0.061 263.4)
#31549B 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) | #315B9E | 0.020 |
| Deuteranopia (no green cones) | #1E529A | 0.019 |
| Tritanopia (no blue cones) | #006470 | 0.099 |
| Achromatopsia (no color) | #565656 | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31549B
#31549B
oklch(45.8% 0.123 262.8)
- #715100
#715100
oklch(45.7% 0.094 82.2)
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 #31549B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.026
- Denim Blue #3B5B92 ΔE 0.030
- Light Navy Blue #2E5A88 ΔE 0.039
- Twilight #4E518B ΔE 0.043
- Cobalt #1E488F ΔE 0.044
- Dusky Blue #475F94 ΔE 0.046
- Light Navy #155084 ΔE 0.047
- Blueberry #464196 ΔE 0.053
Use #31549B 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.