#313A72
Closest named color: Twilight Blue (#0A437A). oklch(37.1% 0.096 273.9), rgb(49, 58, 114).
Aa
White text reads best on this color (10.61:1).
About this color
#313A72 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.096 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.041 away. White text reads best on it, at 10.61:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.97:1 |
| White text | 10.61:1 |
Values
| HEX | #313A72 |
| RGB | rgb(49, 58, 114) |
| HSL | hsl(232, 40%, 32%) |
| OKLCH | oklch(37.1% 0.096 273.9) |
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 #313A72 | 10.61:1 | AAA | Lc -98.4 | Preferred for body text |
| Black text on #313A72 | 1.97:1 | Fails | Lc 9.5 | Not readable |
| #313A72 text on white | 10.61:1 | AAA | Lc 94.4 | Preferred for body text |
| #313A72 text on black | 1.97:1 | Fails | Lc -8.1 | 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 900.
-
Step 50
50
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E5E9F8
oklch(93.5% 0.021 274)
-
Step 200
200
#D0D8F4
oklch(88.5% 0.04 272.9)
-
Step 300
300
#B2BEF0
oklch(81% 0.072 274.2)
-
Step 400
400
#8A9BE8
oklch(70.7% 0.114 273.6)
-
Step 500
500
#6F80E1
oklch(63.1% 0.146 274)
-
Step 600
600
#5867CF
oklch(55.6% 0.16 273.9)
-
Step 700
700
#4955B3
oklch(49.1% 0.148 274.1)
-
Step 800
800
#3B4691
oklch(42.6% 0.123 273.7)
-
Step 900
900 (this color)
#313A72
oklch(37.1% 0.096 273.9)
-
Step 950
950
#1D2344
oklch(26.9% 0.062 273.8)
#313A72 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) | #204174 | 0.026 |
| Deuteranopia (no green cones) | #183C71 | 0.029 |
| Tritanopia (no blue cones) | #104650 | 0.085 |
| Achromatopsia (no color) | #3F3F3F | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313A72
#313A72
oklch(37.1% 0.096 273.9)
- #4D3F00
#4D3F00
oklch(37.2% 0.076 94.7)
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 #313A72, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.041
- Marine Blue #01386A ΔE 0.049
- Prussian Blue #1D3557 ΔE 0.057
- Dark Slate Blue #483D8B ΔE 0.057
- Cobalt #1E488F ΔE 0.059
- Dark Grey Blue #29465B ΔE 0.061
- Light Navy #155084 ΔE 0.067
- Marine #042E60 ΔE 0.071
Use #313A72 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.