#313D73
Closest named color: Twilight Blue (#0A437A). oklch(37.9% 0.093 271.9), rgb(49, 61, 115).
Aa
White text reads best on this color (10.26:1).
About this color
#313D73 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.093 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.037 away. White text reads best on it, at 10.26:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.093) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.04:1 |
| White text | 10.26:1 |
Values
| HEX | #313D73 |
| RGB | rgb(49, 61, 115) |
| HSL | hsl(229, 40%, 32%) |
| OKLCH | oklch(37.9% 0.093 271.9) |
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 #313D73 | 10.26:1 | AAA | Lc -97.7 | Preferred for body text |
| Black text on #313D73 | 2.04:1 | Fails | Lc 10.3 | Not readable |
| #313D73 text on white | 10.26:1 | AAA | Lc 93.7 | Preferred for body text |
| #313D73 text on black | 2.04:1 | Fails | Lc -8.9 | 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
#B0BFEF
oklch(81% 0.07 271.2)
-
Step 400
400
#889CE6
oklch(70.7% 0.111 271.8)
-
Step 500
500
#6C82DF
oklch(63.2% 0.142 271.8)
-
Step 600
600
#5569CD
oklch(55.6% 0.155 271.9)
-
Step 700
700
#4557B1
oklch(49.1% 0.144 271.6)
-
Step 800
800
#394790
oklch(42.6% 0.121 272.2)
-
Step 900
900 (this color)
#313D73
oklch(37.9% 0.093 271.9)
-
Step 950
950
#1C2443
oklch(27% 0.059 271.1)
#313D73 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) | #254475 | 0.023 |
| Deuteranopia (no green cones) | #1D3E72 | 0.024 |
| Tritanopia (no blue cones) | #0E4952 | 0.083 |
| Achromatopsia (no color) | #414141 | 0.093 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313D73
#313D73
oklch(37.9% 0.093 271.9)
- #514000
#514000
oklch(37.9% 0.077 91.7)
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 #313D73, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.037
- Marine Blue #01386A ΔE 0.052
- Cobalt #1E488F ΔE 0.054
- Dark Slate Blue #483D8B ΔE 0.055
- Dark Grey Blue #29465B ΔE 0.056
- Light Navy #155084 ΔE 0.059
- Prussian Blue #1D3557 ΔE 0.060
- Blueberry #464196 ΔE 0.068
Use #313D73 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.